Practice Problems — Set 17

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

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

Warm-up

1. Talk through today's focus: Teen numbers as 10 and ones 2. Try one oral example together before writing. 3. Use the diagram to explain your thinking.

_See printable PDF for diagram._

Written practice

1. 18 = 10 + ___ 2. Draw 16 as one ten and ones. 3. Write the teen number: ten and 8 ones → ___ 4. Decompose 12: ___ + ___ 5. Which shows 17? (A) 10+6 (B) 10+7 (C) 7+10 — write the letter: ___ 6. Write numerals 11–15 in order. 7. Explain your thinking for set 17 in one sentence. 8. Create your own problem for K.NBT.A.1.

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More written practice

1. Apply Teen numbers as 10 and ones (item 9, set 17): show your work. ___ 2. Apply Teen numbers as 10 and ones (item 10, set 17): show your work. ___ 3. Apply Teen numbers as 10 and ones (item 11, set 17): show your work. ___ 4. Apply Teen numbers as 10 and ones (item 12, set 17): show your work. ___ 5. Apply Teen numbers as 10 and ones (item 13, set 17): show your work. ___ 6. Apply Teen numbers as 10 and ones (item 14, set 17): show your work. ___

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Patterns and rules

1. Teen numbers are 10 and some ones. 2. Partners that make 10 help with quick facts. 3. The whole equals the sum of the parts.

_See printable PDF for diagram._

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Stretch

1. Create your own K.NBT.A.1 question for a parent to solve. 2. Explain your method in two sentences.

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Parent tip: Fill one full ten-frame plus extras