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Multiplying fractions by whole numbers
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[available in the book] | ||||||||||||||||
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Multiplication of whole numbers can be solved by repeated addition: 5 × 4 = 4 + 4 + 4 + 4 + 4 = 20 3 × 120 = 120 + 120 + 120 = 360 Multiplying a fraction by a whole number can be solved the same way: |
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2. Write the multiplication problems as addition problems and solve. Remember to give your answer as a mixed number and simplify the fractional parts to lowest terms whenever possible.
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3. Solve. Can you find a SHORTCUT where you don't have to solve these by actually adding?
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The shortcut is (explain) __________________________________________________________
____________________________________________________________
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We know multiplication can be done in any order.
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4. Multiply.
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[available in the book] | |||||
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A fraction of a number is the same as that fraction TIMES
the number.
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| 5. a. Marlene wants to cut down on sugar - so she
decided to only use 2/3 of the amount of sugar mentioned in the recipe. How much sugar will she need? b. [available in the book] |
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The ideas in this fraction lesson are taken from the Math Mammoth Fractions 2 book. Only a few examples of each problem type are shown; you should make more problems of each kind for the student.
| Math Mammoth Fractions 2 A self-teaching worktext that teaches fractions using visual models, a sequel to Math Mammoth Fractions 1. The book covers simplifying fractions, multiplication and division of fractions and mixed numbers, converting fractions to decimals, and ratios. Available as an affordable download ($5.00), and also as a printed copy. |
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Next lesson: Multiplying fractions by fractions
The fast, FUN, and easy way to learn multiplication. Learn the upper times tales in two sittings using mnemonic stories.
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