WEEK SIX

ESTIMATION

Rounding off decimals to the nearest whole number

Rules for rounding off decimals to the nearest whole number

When rounding off decimals to the nearest whole number, look at the digit in the tenth place.

1. If this digit is 5 or greater than 5, replace the digits after the decimal point with zero and add 1 to the digit in the units place
2. If this digit is less than 5, replace the digits after the decimal point with zero.

Note: ‘≈’ means ‘is approximately equal to

Example: round off the following decimal numbers to the nearest whole numbers.

6.7 ≈ 7 to the nearest whole number

6.3 ≈ 6 to the nearest whole number

17 ≈20 to the nearest ten

EXERCISE 1.

Write to the nearest whole number