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Dividing fractions by a whole numberThe video below shows two kinds of examples of fraction division where we do not have to use the "rule", but instead can use "mental math". The first type is dividing fractions by whole numbers. The second is divisions where the answer is a whole number.
1. Color each person's share with a different color, and write a division sentence.
2. Write a division sentence for each problem and solve.
3. The leftover pie is divided equally. How much does each one get? Write a division sentence.
Can you notice a
shortcut?
4. Solve the following problems, based on the shortcut you hopefully noticed in the previous exercise.
5. Solve the opposite problems: if each person got this much pie, how much was there originally?
6. The leftover pie is divided equally. How much does each one get? Write a division sentence.
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.
Next lesson: Dividing Fractions 2a: How Many Times Does It Fit? |
The fast, FUN, and easy way to learn multiplication. Learn the upper times tales in two sittings using mnemonic stories. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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