Question

Find the L.C.M. of 12 and 18
(a) 6 (b) 36 (c) 12 (d) 18
2. L.C.M. of two co-prime numbers is always
(a) product of numbers (b) sum of numbers
(c) difference of numbers (d)none
3. Find the least number which when divided by 6,15 and 18 leave remainder 5 in each case
(a) 90 (b) 180 (c) 95 (d)185
4. Divisibility by 2,5,10 can be checked by
(a) sum of digits (b) last digit
(c) last two digits (d) last three digits
5. Which is greatest 3-digit number exactly divisible by 8, 10, 12?
(a) 120 (b) 360 (c) 960 (d) 980
6. 4= 2 x 2 , 15= 3 x 5, so H.C.F. of 4 and 15 is
(a) 0 (b) 1 (c) 2 (d) 3
7. Find the least number which when divided by 12, 16, 24 and 36 leaves a remainder 7 in each case.
(a) 150 (b) 151 (c)144 (d) none of these
8. Renu purchases two bags of fertiliser of weights 75 kg and 69 kg. Find the maximum value of weight which can measure the weight of the fertiliser exact number of times.
(a) 150 (b) 138 (c)144 (d) none of these
9. Which of the following is divisible by 3?
(a)15287 (b) 15267 (c) 15286 (d) 152638
10. Which of the following is divisible by 9?
(a)15287 (b) 75267 (c) 15286 (d) 152638
11. If a number is divisible by 9, it must be divisible by __.
(a) 6 (b) 3 (c) 2 (d) 12
12. Numbers having more than two factors are called ________.
(a) Prime numbers (b) Co- prime numbers
(c) Composite numbers (d) Odd numbers
13. What are the prime factors of greatest 4 –digit number?
(a) 3x3x11x101 (b) 9x11x101
(c) 3x33x101 (d) 3 x3 x 11 x11
14. Which of the following expression has prime factors
(a) 24=2x3x4 (b) 56=7x2x2x2
(c) 70= 2x5x7 (d)54=2x3x9
15. Which of the following numbers has 4 different prime factors?
(a) 24 (b) 120 (c) 210 (d)100
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Answer 1

Answer:

we are just for helping 2,3 questions you have asked whole ex.

Answer 2

Answer:

1. a

2. a

3. c

4. b

5. c

6. b

10. b

11. b

12. c

13. b

15. a