Adding and subtracting fractions with the same bottom number within one whole · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

When the Bottom Numbers Match

Mathematics · Fractions · ages 7-8
Name ______________________   Date ____________

  1. 6/8 − 3/8 = ?

    • 9/8
    • 3/8
    • 3/4

  2. What is 1/6 + 4/6?

    • 5/6
    • 5/12
    • 4/6
    • 3/6

  3. What is 6/8 − 3/8?

    • 3/8
    • 9/8
    • 4/8
    • 2/8

  4. 2/5 + 2/5 = ?

    • 4/5
    • 4/10
    • 2/5

  5. What is 7/9 − 4/9?

    • 3/9
    • 11/9
    • 4/9
    • 2/9

  6. Which pair of fractions can you add just by adding the top numbers?

    • 3/5 and 1/5
    • 3/5 and 1/4
    • 3/5 and 1/6

  7. Mia ate 2/8 of a pizza and her brother ate 3/8 of it. How much of the pizza did they eat together?

    • 5/8
    • 1/8
    • 5/16
    • 6/8

  8. A pizza is cut into 8 equal slices. 6 slices are left after lunch. At dinner, people eat 3 more slices. What fraction of the pizza is left now?

    • 9/8
    • 3/16
    • 3/8

  9. Diego calculated 2/5 + 2/5 and got 4/10. What mistake did he make?

    • He forgot to add the top numbers
    • He added the bottom numbers too
    • He used the wrong fraction

  10. Which pair of fractions adds up to one whole?

    • 3/8 + 5/8
    • 3/8 + 4/8
    • 6/8 + 3/8
    • 1/8 + 6/8
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Answer key

For grown-ups. Fold this page away before handing over the rest.

When the Bottom Numbers Match W1-mt_a1FdAsRKOF-s1

  1. 3/8 · Subtract the top numbers: 6 − 3 = 3. The bottom number stays 8, so the answer is 3/8.
  2. 5/6 · Both fractions have 6 on the bottom. Add the top numbers: 1 + 4 = 5. The answer is 5/6.
  3. 3/8 · The bottom numbers are both 8, so subtract the top numbers. 6 − 3 = 3, and the answer is 3/8.
  4. 4/5 · Add the top numbers: 2 + 2 = 4. The bottom number stays 5.
  5. 3/9 · The bottom numbers are both 9. Subtract the top numbers: 7 − 4 = 3. The answer is 3/9.
  6. 3/5 and 1/5 · You can only add top numbers directly when the bottom numbers match. Only 3/5 and 1/5 share a bottom number of 5.
  7. 5/8 · Both pieces are eighths. Add the top numbers: 2 + 3 = 5. Together they ate 5/8 of the pizza.
  8. 3/8 · Subtract the top numbers: 6 − 3 = 3. The bottom number stays 8, so 3/8 is left.
  9. He added the bottom numbers too · Diego added both the top and bottom numbers. The bottom number should stay 5, so the correct answer is 4/5.
  10. 3/8 + 5/8 · 3/8 + 5/8 = 8/8. When the top number and bottom number are the same, the fraction equals one whole.
Worksheet · LightMySky