Question

1.
Choose the correct option.

(i) Find the greatest number which divides 285 and 1249 leaving remainders 9 and 7 respectively
(a) 150
(b) 138
(c) 131
(d) All of these

(ii) The H.C.F of 136, 170 and 255 is
(a) 15
(b) 17
(c) 35
(d) 5

(iii) The H.C.F. of 135, 180 and 540 is
(a) 5
(b) 27
(c) 45
(d) 15

(iv) The prime factorisation of 420 is
(a) 2 x 2 x 5 x 6
(b) 2x3x5x4
(c) 23 x 5 x3 x4
(d) 22x35x7

(v) The L.C.M of 12 and 13 is
(a) 12
(b) 13
(c) 156
(d) 1

(vi) The first five multiples of five are
(a) 10, 15, 20, 25, 30
(b) 1, 10, 15, 20, 25
(c) 25, 20, 15, 10,1
(d) 5, 10, 15, 20, 25

(vii) The L.C.M of 20, 25, 30 and 40
(a) 450
(b) 600
(c) 360
(d) 550
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Answer 1

Answer:

(i) (b) 138

(ii) (b) 17

(iii) (d) 15

(iv) (d) 2x2x3x5x7

(v) (c) 156

(vi) (d) 5,10,15,20,25

(vii) (b) 600