Page 40 - ICSE Math 5

Review Exercise

1. Add the following numbers.

(a) 90,23,09,186 and 75,048 (b) 36,41,214; 57,21,360 and 7,79,479

2. Subtract the following numbers and check your answer.
(a) 8,21,38,640 from 12,05,19,648 (b) 12,60,45,000 from 17,25,00,045

3. Find the missing digits.

(a) CTL L TTh Th H T O (b) CTL L TTh Th H T O

? 4 5 0 ? 3 0 ? ? 3 1 8 ? 9 4 0

+6 3 ? 9 3 ? 7 9 – 2 1 ? 5 6 0 ? 9

7 7 6 0 1 4 ? 1 2 ? 4 ? 6 ? 6 1

4. Solve the following and write the number name for the sum or difference obtained.
(a) Nine lakh thirty-eight thousand seven hundred fifteen plus twenty lakh thirty-five
thousand six hundred twenty-four

(b) Five crore twenty-three lakh ten thousand seven hundred forty plus sixty-four lakh
(c) Four lakh thirty thousand five hundred ninety-seven minus one lakh twenty thousand
three hundred fifty-two

(d) Seventy-seven lakh sixteen thousand four hundred thirty minus thirty-eight lakh
fifty-two thousand one hundred twenty-six

5. Estimate the sum by rounding off each number to the nearest 100. Also, check whether
the sum obtained is close to the actual sum or not.
(a) 46,316 + 3,17,956 (b) 4,21,832 + 5,36,122 (c) 7,29,818 + 64,481

6. Estimate the difference between the following numbers using the estimation method
by rounding off each number to the nearest 1,000. Also, check whether the estimated
difference is correct or not.

(a) 2,53,865 – 1,00,320 (b) 59,43,660 – 44,64,650 (c) 27,42,540 – 19,28,370
7. Solve the following word problems.

(a) Anirudh, Sheetal and Shreshtha donated ` 15,385, ` 10,897 and ` 13,494 respectively.
Find the total amount donated by them?
(b) There are 3,64,330 reference books and 4,22,456 textbooks in a library. Find the total
number of books in the library.

(c) Devesh saved ` 13,950 in April, ` 12,684 in May and ` 14,976 in June. How much
money did he save in all these months?

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