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Working with Fractions

When dividing makes it bigger

A 6 m rope cut into 2 m pieces gives 3 pieces. The same rope cut into 1/2 m pieces gives 12 pieces.

A rope, 6 m long.
Step 1 of 4
  1. A rope, 6 m long.
  2. Pieces of 2 m: 6 ÷ 2 = 3 pieces.
  3. Pieces of 1 m: 6 ÷ 1 = 6 pieces.
  4. Pieces of 1/2 m: 6 ÷ 1/2 = 12 pieces.

The divisor decides

In 6 ÷ 2 = 3, the dividend is 6, the amount you divide. The divisor is 2, what you divide by. The quotient is 3, the answer.

Dividing by a number between 0 and 1 makes the amount bigger. Dividing by a number above 1 makes it smaller. Dividing by 1 leaves it alone.

That holds for any amount above zero.

Why? A piece under 1 fits more often than a piece of 1. A piece over 1 fits less often.

To find 6 ÷ 2/3, multiply by the flip, 3/2. 6 × 3/2 = 18/2 = 9.

Guess the way it moves in the lab. Then look at the bars.

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This track

  1. 0 Start here
  2. 1 More than one whole
  3. 2 Renaming until the pieces match
  4. 3 Adding pieces that do not match
  5. 4 Taking one fraction from another
  6. 5 Wholes and parts together
  7. 6 Checkpoint: renaming, adding and taking away
  8. 7 A fraction of a whole number
  9. 8 A fraction of a fraction
  10. 9 When multiplying makes it smaller
  11. 10 The number that undoes a fraction
  12. 11 How many of these fit inside that
  13. 12 Checkpoint: multiplying and dividing
  14. 13 Cancel before you multiply
  15. 14 Share a fraction equally
  16. 15 When dividing makes it bigger
  17. 16 A fraction of what is left
  18. 17 The big picture
  19. 18 Track quiz

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