Practice Problems — Set 20

K.CC.A.1 · Count to 100 by ones and by tens

Print and write your answers in the blanks. Use the diagrams to explain your thinking.

Count together

1. Count from 1 to 20 aloud with a parent. 2. Draw 22 objects. Count them as you write the numeral. 3. Count from 10 to 60 by tens aloud.

_See printable PDF for diagram._

Written practice

1. Write the next numbers: 20, 21, ___, ___, ___ 2. Fill in: 10, 20, ___, 40, ___, 60 3. Write the numeral: fourteen → ___ 4. Complete by ones: 22, 23, ___, 25 5. What comes after 30? ___ 6. What comes before 31? ___ 7. Write the next numbers: 65, 66, ___, ___, ___ 8. Write the next numbers: 66, 67, ___, ___, ___ 9. Write the next numbers: 67, 68, ___, ___, ___ 10. Fill in by tens: 10, 20, ___, 30, ___

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More written practice

1. Fill in by tens: 15, 25, ___, 45 2. Write every tenth number from 10 to 50. 3. Start at 60 and write the next eight numbers. 4. Word problem: You have 40 blocks and get 1 more. How many now? ___

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Patterns and rules

1. What rule: 20, 21, 22, 23 → add ___ each time. 2. Counting by tens (10, 20, 30): what do we add each time? ___ 3. Circle the rule: (A) add 1 each time (B) add 10 each time — for 5, 6, 7, 8 4. Explain in one sentence: How is counting by tens different from counting by ones?

_See printable PDF for diagram._

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Parent tip: Touch each object once while saying one number. Writing numerals builds fluency.