Counting forwards and backwards · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Counting by threes

Mathematics · Counting & Cardinality · ages 6-7
Name ______________________   Date ____________

  1. Start at 0 and count by 3s. Which number will you say?

    • 4
    • 6
    • 7

  2. Count back in 3s: 30, 27. What comes next?

    • 24
    • 25
    • 26
    • 23

  3. Count in 3s: 3, 6, 9, ?, 15. What is missing?

    Answer: ______________

  4. Count by 3s: 3, 6, 9, __. What comes next?

    • 10
    • 12
    • 13

  5. From 15, five jumps of 3 reach 30. Is that right?

    Circle one:   True   False

  6. Count back in 3s: 30, 27, 24, 21. What comes next?

    • 17
    • 18
    • 19
    • 20

  7. Count in 3s: 21, 24, ?, 30. What is missing?

    Answer: ______________

  8. Which list shows counting by 3s?

    • 3, 6, 9, 12
    • 3, 5, 7, 9
    • 3, 6, 10, 13

  9. Milo counts by 3s but says: 3, 6, 9, 11, 14. Where did he make a mistake?

    • Between 9 and 11
    • Between 6 and 9
    • Between 3 and 6

  10. 26 is a multiple of 3. Is that right?

    Circle one:   True   False

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Answer key

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

Counting by threes W1-mt_aHAM29nidj-s1

  1. 6 · Counting by 3s from 0 goes 0, 3, 6. 4 and 7 are not multiples of three.
  2. 24 · 27 - 3 = 24.
  3. 12 · 9 + 3 = 12, and 12 + 3 = 15.
  4. 12 · Add 3 to 9: 9 + 3 = 12.
  5. True · Right: 5 jumps of 3 make 15, and 15 + 15 = 30.
  6. 18 · 21 - 3 = 18.
  7. 27 · 24 + 3 = 27.
  8. 3, 6, 9, 12 · Each number is 3 more than the last: 3, 6, 9, 12. The other lists skip around.
  9. Between 9 and 11 · After 9, adding 3 gives 12, not 11. That is where he broke the pattern.
  10. False · Wrong: 24 and 27 are the multiples around it.
Worksheet · LightMySky