Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/leastcommondenominator.php Students learn to add unlike fractions by first finding a common denominator. For example, to add 1/2 + 1/3, first find the common denominator of 2 and 3, or the Least Common Multiple of 2 and 3, which is 6. Then multiply the numerator and denominator of 1/2 by 3, to get the equivalent fraction 3/6, and multiply the numerator and denominator of 1/3 by 2, to get the equivalent fraction 2/6. Next, add the like fractions, 3/6 + 2/6, to get 5/6. So 1/2 + 1/3 = 5/6. Students also learn to subtract unlike fractions by following the same process that is used when adding unlike fractions. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/dividingdecimals.php Students learn to divide a decimal by a decimal by first multiplying both decimals by the power of 10 that changes the second decimal to a whole number. For example, to divide 0.16 by 0.8, first multiply both decimals by 10, to get 1.6 8. Next, divide the decimal by the whole number in the same way that one would divide a whole number by a whole number (using long division). However, at the end of the problem, the decimal point is brought straight up from the decimal that is inside the division symbol to the answer that is written on top of the division symbol. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/dividingmixednumbers.php Students learn to divide mixed numbers by first rewriting the mixed numbers as improper fractions, then dividing the improper fractions, then rewriting the resulting improper fraction as a mixed number, if necessary. For example, to simplify 3 1/3 1 4/7, first rewrite the mixed numbers as improper fractions, to get 10/3 11/7. Next, change the division sign to multiplication and flip the second fraction, to get 10/3 x 7/11. Next, multiply across the numerators and denominators to get 70/33. Finally, rewrite 70/33 as the mixed number 2 4/33. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/customaryunitconversion.php Students learn the following customary units of measurement: inch, foot, ounce, ton, fluid ounce, pint, gallon, yard, pound, cup, quart, and so on. Students also learn to convert from one customary unit of measurement to another using the following conversion factors: 60 seconds = 1 minute, 7 days = 1 week, 3 feet = 1 yard, 16 ounces = 1 pound, 4 quarts = 1 gallon, and so on. Students are then asked to solve problems using conversion factors, such as 18 feet = ____ inches. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/multiplyingdecimals.php Students learn to multiply decimals in the same way that one would multiply whole numbers (vertically). However, at the end of the problem, students must determine where the decimal goes in the answer by counting the total number of digits to the right of the decimal point in the original numbers, then placing the decimal point in the answer so that the answer has this same total number of digits to the right of the decimal point. For example, after multiplying 1.05 x 7.4, since there are a total of 3 digits to the right of the decimal point in the original numbers, place the decimal point in the answer so that there are 3 digits to the right of the decimal point. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/leastcommonmultiple.php Students learn that multiples of a number come from multiplying the given number by whole numbers. For example, 3 x 0 = 0, 3 x 1 = 3, 3 x 2 = 6, 3 x 3 = 9, 3 x 4 = 12, 3 x 5 = 15, etc., so 0, 3, 6, 9, 12, and 15 are all multiples of 3. Students also learn that the Least Common Multiple is the smallest multiple that two numbers have in common (not including zero). For example, to find the Least Common Multiple of 6 and 18, since multiples of 6 are 6, 12, 18, 24, and 30, etc., and multiples of 18 are 18, 36, 54, etc., the Least Common Multiple of 6 and 18 is 18. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/decimalwordproblems.php Students learn to solve word problems that involve adding or subtracting decimals. For example: Margaret is mailing three letters that weigh 3.7 oz., 2.913 oz., and 2.82 oz. What is the combined weight of the letters? Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/multiplyingdecimals.php Students learn to multiply decimals in the same way that one would multiply whole numbers (vertically). However, at the end of the problem, students must determine where the decimal goes in the answer by counting the total number of digits to the right of the decimal point in the original numbers, then placing the decimal point in the answer so that the answer has this same total number of digits to the right of the decimal point. For example, after multiplying 1.05 x 7.4, since there are a total of 3 digits to the right of the decimal point in the original numbers, place the decimal point in the answer so that there are 3 digits to the right of the decimal point. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/dividingfractions.php Students learn to divide fractions by first changing the division sign to multiplication and flipping the second fraction. For example, to simplify 7/12 divided by 7/9, first change the division sign to multiplication and flip the second fraction, to get 7/12 x 9/7. Next, multiply the fractions by first cross-canceling, then multiplying across the numerators and across the denominators. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/subtractingmixednumbers.php Students learn to subtract mixed numbers by first subtracting the fractions, then subtracting the whole numbers. For example, to subtract 6 1/3 - 4 2/3, first subtract 1/3 � 2/3. However, notice that 1/3 � 2/3 equals a negative fraction. In this situation, the first fraction, 6 1/3, can be rewritten as 5 + 1 1/3, or 5 + 4/3, or 5 4/3. Therefore, the original problem, 6 1/3 - 4 2/3, can be rewritten as 5 4/3 - 4 2/3. Now, subtract the fractions, 4/3 � 2/3, to get 2/3, and subtract the whole numbers, 5 �4, to get 1. So 5 4/3 - 4 2/3 = 1 2/3. Note that some of the problems in this lesson also require the student to find a common denominator for the fractions. For example, 8 5/16 - 1 1/8. Watch Video on...
YourTeacher.com offers a comprehensive library of online math lessons aligned with the Holt Pre Algebra textbooks. Simply go to http://www.yourteacher.com, click on the picture of your textbook, enter your page number, and access the exact lesson you need! Perfect for math homework help, every online lesson from YourTeacher.com features video examples, interactive practice, multiple choice self-tests, and more. Watch Video from...
Students learn to divide fractions by first changing the division sign to multiplication and flipping the second fraction. For example, to simplify 7/12 divided by 7/9, first change the division sign to multiplication and flip the second fraction, to get 7/12 x 9/7. Next, multiply the fractions by first cross-canceling, then multiplying across the numerators and across the denominators.**See more education videos by TeacherTube Member yourteacher at http://www.TeacherTube.com*** Math Help -...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/subtractingwholenumbers.php Students learn to subtract numbers with two or more digits, such as 985 - 47. The first step is to line up the numbers vertically so that the units digits are in the same column. Next, subtract the units digits, the tens digits, and the hundreds digits. When subtracting the units digits, notice that it is not possible to subtract 7 ones from 5 ones, so 1 ten must be borrowed from the tens column, leaving 7 tens and 15 ones. Now, subtracting the units digits, 15 - 7 = 8, subtracting the tens digits, 7 - 4 = 3, and subtracting the hundreds digits, 9 - 0 = 9. So 985 - 47 = 938. Note that the answer to a subtraction problem is called the difference, so the difference of 985 - 47 is 938. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/addingmixednumbers.php Students learn to add mixed numbers by first adding the fractions, then adding the whole numbers. For example, to add 4 2/5 + 7 4/5, first add 2/5 + 4/5 to get 6/5, then add 4 + 7 to get 11. So 4 2/5 + 7 4/5 = 11 6/5. Notice, however, that the answer, 11 6/5, contains an improper fraction, 6/5, which is the same as 1 1/5, so 11 6/5 can be rewritten as 11 + 1 1/5, which simplifies to 12 1/5. So 4 2/5 + 7 4/5 = 12 1/5. Note that some of the problems in this lesson also require the student to find a common denominator for the fractions. For example, 5 1/4 + 6 3/8. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/unitrate.php Students learn that a rate is a comparison of two measurements or amounts that have different units. For example, 60 miles in 2 hours is a rate. Students learn that a unit rate is a rate in which the second rate is 1 unit. For example, 30 miles in 1 hour, or 30 miles per hour, is a unit rate. In the problems in this lesson, students are given a rate, and are asked to find the corresponding unit rate. For example, if there are 70 students in 5 classes, find the number of students per class. To find the unit rate, divide the numerator and denominator of the given rate by the denominator of the given rate. So in this case, divide the numerator and denominator of 70/5 by 5, to get 14/1, or 14 students per class, which is the unit rate. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/estimatingproducts.php Students learn to estimate a product or quotient by first rounding each number to one non-zero digit. For example, to estimate 8,291 x 27, first round 8,291 down to 8,000, and round 27 up to 30, then multiply 8,000 x 30 to get 240,000. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/estimatingproducts.php Students learn to estimate a product or quotient by first rounding each number to one non-zero digit. For example, to estimate 8,291 x 27, first round 8,291 down to 8,000, and round 27 up to 30, then multiply 8,000 x 30 to get 240,000. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/comparingdecimals.php Students learn to compare decimals by first lining up the decimals, then comparing numbers place-by-place, starting on the left. For example, to compare 17.456 and 17.501, the 1's in the tens place are the same, and the 7's in the units place are the same. However, in the tenths place, Watch Video on...
YourTeacher.com ( http://www.yourteacher.com ) offers comprehensive pre algebra homework help - a complete library of online pre algebra lessons featuring a personal pre algebra teacher inside every lesson! Students can easily find help with pre algebra homework by simply clicking on the picture of their textbook and typing in their page number to access the exact pre algebra lesson from yourteacher.com that they need. The perfect pre algebra homework helper! Watch Video from...
Here are five exponentially important rules of when working with exponents! These helpful tips can significantly reduce your workload when dealing with larger numbers. Pre-Algebra:...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/denominator.php Students learn the definitions of the numerator and denominator of a fraction. Students also learn to write a fraction that represents the shaded part of a given figure, by writing the number of shaded parts over the total number of parts. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/boxandwhiskerplot.php Students learn to make a box-and-whisker plot for a given data set using the following steps. First, write the data set in order from least to greatest. Next, find the second quartile, which is the median for the entire data set. Next, find the first quartile, which is the median for the lower half of the data set, and find the third quartile, which is the median for the upper half of the data set. Next, find the least and greatest numbers in the data set. Next, draw a number line with vertical lines at the first, second, and third quartiles, and connect the endpoints of the vertical lines to make a Watch Video on...
YourTeacher.com offers a comprehensive library of online math lessons aligned with the Glencoe Pre Algebra textbooks. Simply go to http://www.yourteacher.com, click on the picture of your textbook, enter your page number, and access the exact lesson you need! Perfect for math homework help, every online lesson from YourTeacher.com features video examples, interactive practice, multiple choice self-tests, and more. Watch Video from...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/mathprobability.php Students learn that probability is the likelihood that a given event will happen, and probability can be found using the following ratio: (number of favorable outcomes) / (number of total outcomes). For example, the probability that the flip of a coin will come up heads is: (1 favorable outcome) / (2 possible outcomes), or 1/2. Note that probability can be written as a fraction (1/2), a decimal (0.5) or a percent (50%). Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/multiplyingmixednumbers.php Students learn to multiply mixed numbers by first rewriting the mixed numbers as improper fractions, then multiplying the improper fractions together, then rewriting the resulting improper fraction as a mixed number, if necessary. For example, to multiply 1 8/15 x 1 1/4, first rewrite the mixed numbers as improper fractions, to get 23/15 x 5/4. Next, cross-cancel the 15 and 5 to 3 and 1, and we have 23/3 x 1/4. Next, multiply across the numerators and denominators to get 23/12. Finally, rewrite 23/12 as the mixed number 1 11/12. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/stemandleafplot.php Students learn that a stem-and-leaf plot is set up as a two-column table with stems of the given numbers on one side and the leaves of the given numbers on the other. The stem of a number is the digit or digits on the left side of the number, and the leaf of a number is the final right-hand digit. Students also learn that a frequency chart is a table that lists each member of a data set along with the number of times (the frequency) that the member appears. Students are then asked to create stem-and-leaf plots or frequency tables using given data, and answer questions based on given stem-and-leaf plots or frequency tables. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/dilationmath.php Students learn that when the dimensions of a figure are increased or decreased to create a new figure that is similar to the original figure, the transformation is called a dilation. Students are then asked to determine whether a given transformation on a coordinate system represents a dilation. Students are also asked to graph a dilation of a given figure on a coordinate system by multiplying all of the coordinates of the vertices of the figure by a given number. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/primefactors.php Students learn that a factor of a number divides into the number without a remainder. For example, 7 is a factor of 14, because 7 divides into 14 without a remainder. To find the factors of a number, such as 8, first divide 8 by 1, which equals 8. Since there is no remainder, both 1 and 8 are factors of 8. Next, divide 8 by 2, which equals 4. Since there is no remainder, both 2 and 4 are factors of 8. Next, divide 8 by 3. Since 8 is not divisible by 3, then 3 is not a factor of 8. Next, divide 8 by 4, which equals 2. Since there is no remainder, both 4 and 2 are factors of 8. Notice, however, that 4 and 2 are repeat factors (we already know that 4 and 2 are factors of 8). This means that all other factors will also be repeat factors, so there is no need to continue -- the factors of 8 are 1, 2, 4, and 8. Note that a number that has more than two factors, such as 8, is called a composite number, and a number that has only two factors (itself and 1), such as 5, is called a prime number. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/primefactorization.php Students learn that the prime factorization of a number is the given number written as the product of its prime factors. For example, to find the prime factorization of 45, use a factor tree to find that 45 is 5 x 9, and 9 is 3 x 3. So the prime factorization of 45 is 5 x 3 x 3, or 5 x 3^2. Note that the prime factorization of a prime number, such as 23, is the number itself. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/powerof10.php Students learn that a power of ten is an expression written in exponential form that has a base of ten. For example, 10^3 and 10^(-4) are powers of ten. To write a power of ten, such as 10^3, in standard form, begin with 1.0. Next, since the exponent on the power of ten is positive, move the decimal point to the right 3 places, to get 1000. So 10^3 in standard form is 1000. Note that if the exponent on the power of ten is negative, the decimal on the 1.0 is moved to the left. Students also learn to write a number as a power of ten, such as 0.0000001, by determining the number of places the decimal must be moved to get 1.0, which in this case is 7 places. Next, since the original number is a decimal, the exponent will be negative, so the answer is 10^(-7). Note that if the original number is a whole number, then the exponent will be positive. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/percentageincrease.php Students learn to find the percent increase or percent decrease between two numbers, using the following formula: amount of change/ original number. For example, to find the percent decrease if the price changes from $60 to $39, since the amount of change is $21, and the original number is $60, the percent decrease is $21/$60, which simplifies to 0.35. And remember that the answer is a percent, so move the decimal point two places to the right, to get 35%. So if the price changes from $60 to $39, the percent decrease is 35%. Watch Video on...
YourTeacher.com offers a comprehensive library of online math lessons aligned with the Prentice Hall Pre Algebra textbooks. Simply go to http://www.yourteacher.com, click on the picture of your textbook, enter your page number, and access the exact lesson you need! Perfect for math homework help, every online lesson from YourTeacher.com features video examples, interactive practice, multiple choice self-tests, and more. Watch Video from...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/discountformula.php Students solve word problems using the Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/histogram.php Students learn that a histogram is a type of bar graph that shows the frequency of data in various intervals (such as the number of residents in a given neighborhood that are age 21-30, age 31-40, and so on). Note that the difference between a histogram and a bar graph is that in a histogram, the data is organized into intervals. Students are then asked to create histograms using given data, and answer questions based on given histograms. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/lineplot.php Students learn that a line plot is a graph that shows the shape of a data set by using x's above each value on a number line. Students also learn that a pictograph is a graph that shows data using picture symbols. Students are then asked to create line plots or pictographs using given data, and answer questions based on given line plots or pictographs. Watch Video on...
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/scientificnotation.php Students learn that a number is in scientific notation if it composed of a whole number or decimal between 1 and 10, times a power of ten. For example, 4.13 x 10^8 is in scientific notation. To convert a number from scientific notation to standard notation, note that a positive exponent means that the decimal point is moved to the right, and a negative exponent means that the decimal point is moved to the left. For example, to convert 4.13 x 10^8 to standard notation, since the exponent is positive 8, move the decimal 8 places to the right, to get 413,000,000. Watch Video on...

Page: 1 of 14

Next Page