Page 20 - ICSE Math 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 write zeros at the hundreds, tens and
ones places. Keep the digit at the thousands place as it is.
• If the digit at the hundreds place is 5 or more, then write zeros at the hundreds, tens and
ones places. Also, add 1 to the digit at the thousands place.

Example 12: Round off 1,85,63,901 to the nearest 1,000.
Solution: 1,85,63,901 is rounded off to 1,85,64,000 since the digit at the hundreds place is 9.

Exercise 1.4

1. Round off the following numbers to the nearest 10.
(a) 14,21,346 (b) 27,83,093 (c) 1,00,92,347
(d) 3,12,42,178 (e) 24,99,862 (f) 60,61,069

2. Round off the following numbers to the nearest 100.
(a) 36,92,406 (b) 12,31,369 (c) 1,00,24,571

(d) 17,17,513 (e) 1,04,12,314 (f) 8,88,45,582
3. Round off the following numbers to the nearest 1,000.

(a) 46,36,149 (b) 49,09,607 (c) 8,21,72,702
(d) 7,31,20,013 (e) 54,43,21,894 (f) 1,04,31,275

4. Rewrite this news headline by rounding off the number to the nearest 1,000.
‘The NDMC spent ` 33,95,483 on repairing roads’.

Review Exercise

1. Write the following numbers in both the Indian and International number systems using
commas.

(a) 94326140 (b) 436547832 (c) 10234793 (d) 39462149

2. Fill in the blanks.
(a) 10 million = lakhs (b) 2 million = lakhs

(c) 250 million = crores (d) 20 crores = million

3. Find the sum and the difference of the place values of the underlined digits in the given
numbers.

(a) 7,48,65,325 (b) 11,94,32,612 (c) 3,21,45,870

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