Question

Choose the appropriate alternative.
1. The GCD of 27x²y and 18xy² is
(A) 9xy²
(B) 9xy
(C) 3xy
(D) 54x²y
2. The LCM of 25x³yz² and 9xy²z² is
(A) x³yz (B) 225x³y²z² (C) 225xyz
(D) xyz²
3. The ratio of two numbers is 5 : 7 their HCF is 8. Therefore their LCM is
(A) 40
(B) 28
(C) 280
(D) 2240
4. HCF of x² - y² and x² + y² is
(A) X-y
(B) x + y
(C) x² - xy + y2 (D) (x + y)?
2 1 3 4
5. Find LCM of
2/3 1/7 3/5 4/7

(A)7/12
(B)5/12
(C)12/5
(D) 12

6. Find HCF of 3556 and 3444.
(B) 47
(C) 28
(D) 7
7. HCF of 3240, 3600 and a third number is 36 and their LCM is 24 x 35 x 52 x 72 then
find 3rd number.
(A) 47,628
(B) 24,500
(C) 39,200 (D) Any other
9 12 18 21
8. HCF of
and is
9/10 12/15 18/35 21/40

(A)2/3
(B)252/5
(C)3/2800
(D)63/700
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Answer 1

Answer:

sooooooooo long sooooooo long