Estimation – Math Grade 3

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Round off the whole numbers to the nearest 10 and 100.

My father paid Rs 1 209 for buying fuel. How can we round off this amount to the nearest 10.

Rules:

While Rounding off to the nearest 10.

  • If the digit at ones place between 0 to 4 or less than 5 then the digit at ones place by 0. 24 is 20 when rounded to the nearest 10. 24 is rounded off to 20.
  • If the digit at ones place is 5 or greater than 5 then the digit at ones place is replaced by ‘0’ and the digit at tens place is increased by “1”. 36 is rounded off to 40.

Rounding off to the nearest 100

While rounding off to the nearest 100:

  • If the digit at the tens place is between 0 to 5 or less than 5 then put zeros at the ones and tens place.
  • If the digit at the tens place is equal to 5 or greater than 5 then put zeros at the ones and tens place and the digit at hundreds place is increased by “1”

To round off 666 too the nearest 100. We get 700. It can be written as: 666 = 700

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