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Math Grade 2-3 Answer Key

Rounding Numbers to the Nearest Ten

Use ones digits and number lines to round

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Rounding Numbers to the Nearest Ten

Use ones digits and number lines to round

Math - Grade 2-3

Instructions: Read each problem carefully. Round each number to the nearest ten. Show your work in the space provided.
  1. 1

    Round 24 to the nearest ten.

    Look at the ones digit.

    24 rounds to 20 because the ones digit is 4, and 4 is less than 5.
  2. 2

    Round 67 to the nearest ten.

    67 rounds to 70 because the ones digit is 7, and 7 is 5 or greater.
  3. 3

    Use the number line to round 43 to the nearest ten.

    Find whether 43 is closer to 40 or 50.

    43 rounds to 40 because it is closer to 40 than to 50.
  4. 4

    Round 85 to the nearest ten.

    A ones digit of 5 means round up.

    85 rounds to 90 because numbers ending in 5 round up to the next ten.
  5. 5

    Round 31 to the nearest ten.

    31 rounds to 30 because the ones digit is 1, and 1 is less than 5.
  6. 6

    Use the number line to round 58 to the nearest ten.

    Count how far 58 is from 50 and from 60.

    58 rounds to 60 because it is closer to 60 than to 50.
  7. 7

    Round 102 to the nearest ten.

    102 rounds to 100 because the ones digit is 2, and 2 is less than 5.
  8. 8

    Round 149 to the nearest ten.

    When the ones digit is 5, 6, 7, 8, or 9, round up.

    149 rounds to 150 because the ones digit is 9, and 9 is 5 or greater.
  9. 9

    Use the number line to round 126 to the nearest ten.

    126 rounds to 130 because it is closer to 130 than to 120.
  10. 10

    A class collected 74 cans for recycling. Round 74 to the nearest ten.

    The nearest ten will be either 70 or 80.

    74 rounds to 70 because the ones digit is 4, and 4 is less than 5.
  11. 11

    A library has 235 picture books on a shelf. Round 235 to the nearest ten.

    235 rounds to 240 because numbers ending in 5 round up to the next ten.
  12. 12

    Use the number line to round 92 to the nearest ten.

    Compare the distance from 92 to 90 and from 92 to 100.

    92 rounds to 90 because it is closer to 90 than to 100.
  13. 13

    Round 999 to the nearest ten.

    999 rounds to 1000 because the ones digit is 9, and 9 is 5 or greater.
  14. 14

    Mia ran 116 meters. Round 116 to the nearest ten.

    The nearest ten will be either 110 or 120.

    116 rounds to 120 because the ones digit is 6, and 6 is 5 or greater.
  15. 15

    Use the number line to round 171 to the nearest ten.

    171 rounds to 170 because it is closer to 170 than to 180.
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