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- Dividing Fractions

- Recommended for Grades 5 to 8
- CCSS Alignment
- Topic Description
- Key Terms

Keep, change, flip! Dividing fractions is no problem when you have this mnemonic to guide you through the process.

Using ‘Keep, change, flip' is simple.
*
Keep
*
the first fraction as is,
*
change
*
the sign from division to multiplication, and
*
flip
*
the second fraction, putting the numerator on the bottom and the denominator on the top. Then multiply the two fractions to solve.

Solve

Step 1: Change the division sign to multiplication.

Step 2: Flip the second fraction.

Step 3: Multiply.

Dividing by 2 and multiplying by

10 ÷ 2 = 5

The reciprocal of a fraction is its ‘flipped' counterpart--the denominator of one is the numerator of the other, and vice versa. The reciprocal of

Dividing by a fraction and multiplying by that fraction's reciprocal will always give you the same thing.

Description

This video uses the 'Keep, Change, Flip' mnemonic to teach students how to divide fractions. Keep the first fraction the same, change the division sign to multiplication, flip the second fraction over, then solve it the same way as a multiplication problem, by multiplying the numerators and denominators. The song shows students this process with an example problem and explains the math behind it.
Credits

Performance & Lyrics:

Trajik

B. Harrison

Production, Engineering & Mixing:

Daniel Lynas

Video Illustration & Animation:

Megan Dunn

Key Terms

These words are covered in the lyrics.

Test student knowledge of these words with Fill in the Blanks.

- Change
- Dividing
- Division
- Flip
- Fractions
- Half
- Keep
- Multiplication
- Reciprocal
- Reduce
- Sign

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