Write the first two common multiples of the following pair of
Nunbers
(a). 10,15 (b) 7,21
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Multiples of 10 are 10,20,30,40,50,60,…….. Multiples of 15 are 15,30,45,60,75,90,……… The answer is 30. 5 is the Least Common Number which can divide both 10 & 15.
LCM of 7 and 21 is the smallest number among all common multiples of 7 and 21. The first few multiples of 7 and 21 are (7, 14, 21, 28, 35, 42, 49, . . . ) and (21, 42, 63, 84, 105, 126, 147, . . . )
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