Page 52 - Maths Class 06

4. The smallest prime number is:
(a) 1 (b) 2 (c) 3 (d) none

5. Which of the following is a pair of co-primes?
(a) 6, 12 (b) 5, 25 (c) 5, 7 (d) 12, 27
6. Which of the following is a composite number?
(a) 23 (b) 29 (c) 42 (d) 59

7. The total number of prime number up to 100 is:
(a) 20 (b) 3 (c) 24 (d) 25
8. The prime factors of 135 are:
(a) 3, 3, 1 and 5 (b) 3, 5 and 9
(c) 3 and 5 (d) None of these

9. If two numbers are divis i ble by a number, then their __________ is also divis i ble by that number.
(a) sum (b) difference
(c) product (d) sum, difference and product
10. Which of the following numbers is divisible by 3?
(a) 36343 (b) 83463

(c) 68801 (d) None of these

H O T S

1. Find the greatest number of 6-digits exactly divisibly by 24, 15 and 36.
2. Three bells toll at inter vals of 9, 12, 15 minutes. If they start toll ing together, after what time
will they next toll together?
3. Deter mine the two numbers near est to 10,000 which are exactly divis i ble by 2, 3, 4 5, 6 and 7.

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