The teen numbers · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Teen numbers: a ten and some more

Mathematics · Number Representation & Place Value · ages 5-7
Name ______________________   Date ____________

  1. Teen numbers are made from two full tens.

    Circle one:   True   False

  2. Look at the blocks. One group is a full ten. How many blocks are there in all?

    Answer: ______________

  3. Noah says 13 is one ten and three ones. Is Noah right?

    Circle one:   True   False

  4. Which sum shows 17?

    • 7 + 7 = 17
    • 17 + 10 = 7
    • 10 + 7 = 17
    • 10 + 17 = 7

  5. Which explains 15?

    • One ten and five ones
    • Five tens and one one
    • One one and five tens
    • Ten tens and five ones

  6. In the number 13, what does the 1 tell you?

    • There is one single block
    • There is one number missing
    • There is one whole ten

  7. These 12 blocks are in two groups. Which equation matches the picture?

    • 10 + 2 = 12
    • 10 + 5 = 12
    • 2 + 2 = 12

  8. A cup holds ten counters. If 7 more counters sit outside the cup, there are 10 counters in all.

    Circle one:   True   False

  9. Sara has 18 shells. She fills one box that holds exactly ten shells. How many shells are left outside the box?

    Answer: ______________

  10. Ben splits 13 blocks into a group of 8 and a group of 5. Why does this not show 13 as a ten and some ones?

    • Neither group is a full ten
    • 13 is too big to hold a ten
    • There should be three groups
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Answer key

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

Teen numbers: a ten and some more W1-mt_xmmgAzxe5j-s1

  1. False · A teen number holds one full ten, and then a few more ones.
  2. 19 · Ten blocks and 9 more blocks make 19 blocks in all.
  3. True · Noah is right. 13 splits into 10 and 3.
  4. 10 + 7 = 17 · 17 is 10 plus 7.
  5. One ten and five ones · 15 is one ten and five ones.
  6. There is one whole ten · In a teen number the digit in front stands for the whole ten, so the 1 in 13 means one ten.
  7. 10 + 2 = 12 · One group has ten blocks. The other has two, so 10 + 2 = 12.
  8. False · The counters outside count too. Ten in the cup and 7 outside make 17 in all.
  9. 8 · 18 is one ten and 8 ones. The box takes the ten, so 8 shells stay outside.
  10. Neither group is a full ten · A ten and some ones needs one group of exactly ten blocks, and a group of 8 with a group of 5 has no full ten.
Worksheet · LightMySky