Practice Problems — Set 20

K.NBT.A.1 · Teen numbers as 10 and ones

Print and write your answers. Use diagrams to show thinking.

Warm-up

1. 13 = 10 + ___ 2. Draw 15 as one ten and ones. 3. Write the teen number: ten and 6 ones → ___

_See printable PDF for diagram._

Written practice

1. 12 = 10 + ___ 2. Draw 14 as one ten and ones. 3. Write the teen number: ten and 5 ones → ___ 4. Decompose 15: ___ + ___ 5. Which shows 17? (A) 10+6 (B) 10+7 (C) 7+10 — write the letter: ___ 6. Write numerals 11–18 in order. ___ 7. 15 = 10 + ___ 8. Draw 17 as one ten and ones.

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More written practice

1. Write the teen number: ten and 8 ones → ___ 2. Decompose 18: ___ + ___ 3. Write numerals 11–14 in order. ___ 4. 18 = 10 + ___ 5. Draw 15 as one ten and ones. 6. Decompose 13: ___ + ___

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Patterns and rules

1. 11 = 10 + ___ 2. Draw 16 as one ten and ones. 3. Write the teen number: ten and 4 ones → ___

_See printable PDF for diagram._

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Stretch

1. 10 = 10 + ___ 2. Draw 14 as one ten and ones.

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Parent tip: Fill one full ten-frame plus extras