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Math Grade K-1 Answer Key

Tens and Ones: Building Two-Digit Numbers

Build, count, and write two-digit numbers

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Tens and Ones: Building Two-Digit Numbers

Build, count, and write two-digit numbers

Math - Grade K-1

Instructions: Read each problem carefully. Use tens rods, ones cubes, drawings, or numbers to help you. Show your work in the space provided.
  1. 1

    There is 1 ten and 4 ones. Write the two-digit number.

    Start with 10, then count on 4 more.

    The number is 14 because 1 ten is 10 and 4 ones make 14.
  2. 2

    There are 2 tens and 3 ones. Write the two-digit number.

    The number is 23 because 2 tens are 20 and 3 ones make 23.
  3. 3

    Write how many tens and ones are in the number 18.

    The first digit tells the tens, and the second digit tells the ones.

    The number 18 has 1 ten and 8 ones.
  4. 4

    There are 3 tens and 0 ones. Write the number.

    The number is 30 because 3 tens are 30 and there are no extra ones.
  5. 5

    Circle the group that shows 25: 2 tens and 5 ones, or 5 tens and 2 ones.

    Look at the tens digit first.

    The group 2 tens and 5 ones shows 25 because 2 tens are 20 and 5 ones make 25.
  6. 6

    Draw base ten blocks to show the number 16.

    Use one long ten rod, then add 6 single ones.

    A correct drawing shows 1 ten rod and 6 ones cubes.
  7. 7

    There are 4 tens and 7 ones. Write the two-digit number.

    The number is 47 because 4 tens are 40 and 7 ones make 47.
  8. 8

    Write how many tens and ones are in the number 32.

    In 32, the 3 is in the tens place and the 2 is in the ones place.

    The number 32 has 3 tens and 2 ones.
  9. 9

    Fill in the blank: 5 tens and 6 ones make ____.

    5 tens and 6 ones make 56.
  10. 10

    Build 41 using tens and ones. Write the number of tens and ones.

    The digit 4 tells how many tens there are.

    The number 41 is built with 4 tens and 1 one.
  11. 11

    Count the blocks: 2 tens and 8 ones. Write the number.

    The number is 28 because 2 tens are 20 and 8 ones make 28.
  12. 12

    Which number has 6 tens and 2 ones: 26 or 62?

    The tens digit comes first in a two-digit number.

    The number is 62 because 6 tens are 60 and 2 ones make 62.
  13. 13

    Draw a number that has 3 tens and 5 ones. Then write the number.

    A correct drawing shows 3 tens and 5 ones, and the number is 35.
  14. 14

    A number has 7 in the tens place and 4 in the ones place. Write the number.

    Put the tens digit before the ones digit.

    The number is 74 because 7 tens are 70 and 4 ones make 74.
  15. 15

    Look at the blocks: 9 tens and 1 one. Write the number and explain what the digits mean.

    The number is 91. The 9 means 9 tens, and the 1 means 1 one.
LivePhysics™.com Math - Grade K-1 - Answer Key