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Rounding to the nearest 10 and 100

For: Ages 7-10. Updated 2026-10-15.

Rounding replaces a number with a nearby "friendly" number that is easier to work with. To round 67 to the nearest ten, ask which multiple of ten it is closer to, 60 or 70. It is 3 away from 70 and 7 away from 60, so it rounds to 70.

Use a number line

Draw a line from 60 to 70 and mark 65 in the middle. Anything to the right of 65 rounds up to 70, anything to the left rounds down to 60. The picture makes it clear why the ones digit is the only one that matters when rounding to tens.

Exactly halfway

A number such as 65 is equally close to 60 and 70. The usual school convention is to round halfway values up, so 65 becomes 70 and 250 rounded to the nearest hundred becomes 300.

Rounding to hundreds

NumberNearest 10Nearest 100
348350300
351350400
1,9501,9502,000
96100100

Look at 348 and 351. They are only 3 apart, but they round to different hundreds because 350 is the halfway point.

Estimate before you calculate. 398 + 205 is about 400 + 200 = 600, so an answer of 1,603 is clearly wrong.

Round these

Round each number to the place shown. Remember: exactly halfway rounds up.

  1. 84 to the nearest 10
  2. 145 to the nearest 10
  3. 649 to the nearest 100
  4. 2,050 to the nearest 100
Show answers
  1. 80
  2. 150
  3. 600
  4. 2,100

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