Page 22 - ICSE Math 5

Progress Worksheet

Mental Maths

1. Select the correct answer.

(a) Which of the following is the number name of the smallest 6-digit number?
(i) Ten thousand (ii) Ten lakh (iii) Ten million (iv) One lakh

(b) Which of the following represents seven million two hundred five thousand fifty?
(i) 7,205,600 (ii) 7,205,050 (iii) 7,250,050 (iv) 7,025,500

(c) Which of the following is equal to 20 crores?
(i) 2 million (ii) 20 million

(iii) 200 million (iv) None of these
(d) What is the place value of 6 in 26,13,15,754?

(i) 6 lakhs (ii) 6 crores (iii) 60 crores (iv) 60 lakhs
2. Write the predecessor and the successor of the given numbers.

(a) 7,14,99,998 (b) 5,21,46,974 (c) 88,34,14,621

3. Write the following numbers in expanded form.
(a) 14,09,48,584 (b) 6,23,80,417 (c) 16,34,450

4. Fill in the blanks.
(a) 20 million = __________ lakhs (b) 50 million = __________ crores

(c) 30 crores = __________ million (d) 70 lakhs = __________ million
5. Arrange the following numbers in ascending and descending orders.

(a) 1,03,14,620; 1,03,13,635; 1,03,14,627
(b) 48,76,042; 48,87,549; 48,78,432

6. Round off 4,52,24,331 to the nearest 10, 100 and 1,000.
7. Separate the given numbers into periods as per the Indian number system by putting
commas and also write their number names.

(a) 64053216 (b) 213605507 (c) 82654070

8. Write the following numbers.
(a) The smallest 9-digit number (b) The largest 6-digit number

9. Compare the following pairs of numbers. Put the correct sign <, > or =.

(a) 62,76,624 62,67,624 (b) 1,80,23,209 89,00,299

(c) 42,37,46,786 43,37,46,786 (d) 99,999 99,999

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