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Playing With Numbers

Question 10:

Find the LCM of the following numbers:

(a) 9 and 4 (b) 12 and 5

(c) 6 and 5 (d) 15 and 4

Observe a common property in the obtained LCMs. Is LCM the product of two numbers in each case?

Answer:

(a)

2

9, 4

2

9, 2

3

9, 1

3

3, 1

1, 1

LCM = 2 × 2 × 3 × 3 = 36

(b)

2

12, 5

2

6, 5

3

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