Page 20 - Start Up Mathematics_5

Rounding off to the nearest 1,000

To round off a number to the nearest thousand, look at the digit at the hundreds place.

• If the digit at the hundreds place is 4 or less, then place zeros at the hundreds, tens and
ones place. Keep the digit at the thousands place as it is.
• If the digit at the hundreds place is 5 or more, then place zeros at the hundreds, tens and
ones place. Also, add 1 to the digit at the thousands place.

Example 15: Round off (a) 62,53,274 and (b) 85,63,901 to the nearest 1,000.

Solution: (a) 62,53,274 is rounded off to 62,53,000 as the digit at the hundreds place is 2.
(b) 85,63,901 is rounded off to 85,64,000 as the digit at the hundreds place is 9.

Example 16: Round off 38,456 to the nearest (a) 10, (b) 100 and (c) 1,000.

Solution: (a) nearest 10 38,456 → 38,460
(b) nearest 100 38,456 → 38,500

(c) nearest 1,000 38,456 → 38,000

EXERCISE 1.4

1. Look at each number. Tick the nearest 10 from the boxes.

10 90 370
(a) 16 (b) 87 (c) 375
20 80 380

1,690 43,290 3,85,210
(d) 1,687 (e) 43,297 (f) 3,85,213
1,680 43,300 3,85,220

2. Round off the given numbers to the nearest 100, 1,000 and 10,000.

Number Nearest 100 Nearest 1,000 Nearest 10,000

51,357

4,17,504

9,55,724

83,78,209

3,76,42,555

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