Question

Find first three common multiples of:
(iv) 2, 4 and
(1) 4 and 6
(ii) 12 and 18
2. Determine the LCM of each of the following:
(1) 12. 20
(iv) 81, 126, 135, 252
(ii) 20, 36
(iii) 49. 63. 84
3. Find the LCM of the denominators of the following fractions:
7 9
4 13
1
1 3 5
23 1
(iv)
811
65' 91' 117
24 23 48
91 1547
Find the smallest number which when divided by 18 and 37 leaves remainder 3 in
each case
5. Three bells toll at intervals of 16, 24 and 32 seconds. If they begin to toll together, after
how much time will they toll together again?
6. A, B and C start running on a circular track from their respective points. A completes a
full circle in 110 seconds, B in 130 seconds and C in 150 seconds. If they all start from
the same point, when will they all next be at the starting point considering that they all
run at the same speed?
A heap of shots when made up into groups of 28, 32 and 42 leaves always a remainder
5 shots. Find the least number of shots contained in the heap.
​

Answer 1

Answer:

81,126,135,252

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