Question

Self Practice 3H
1. Complete:
(a) Multiples of 2: 2, 4, 6, 8, ...
Multiples of 3: 3, 6, 9, 12, ...
(b) 6 = 2 X 3
LCM of 2 and 3 =
10 = 2 x 5
(c) 9 = 32
LCM of 6 and 10 =
15 = 3 x 5
(d) 4 = 22
LCM of 9 and 15 =
14 = 2 x 7
(e) 12 = 22 x 3
LCM of 4 and 14 = -
32 = 25
(f) 25 = 52
LCM of 12 and 32 =
100 = 52 x 22
2. Find the LCM of the following.
LCM of 25 and 100 =
(a) 7 and 14
(b) 5 and 7
(e) 4 and 10
(c) 13 and 26
(f) 6 and 14
(g) 25 and 20
(i) 14 and 35
(i) 24 and 30
(k) 64 and 80
(m) 4, 8 and 10
(n) 4, 5 and 7
(0) 2, 4, 5 and 6
3. Find the LCM. (Division method will be useful.)
(a) 12, 16 and 18
(b) 7, 21 and 28
(d) 72, 96 and 120
(e) 240, 300 and 600
Think and answer.
(a) If one number is divisible by another number, what is the LCM?
(b) When is the LCM of two numbers equal to the product of the two numbers?
(c) Why cannot you find a greatest common multiple for a group of numbers?
(d) Tell whether the LCM of a group of numbers can be smaller than any of the numbers in the group.
(e) How does the LCM differ from the GCF?
(d) 4 and 5
(h) 27 and 72
(1) 81 and 108
(p) 4, 8, 16 and 64
(c) 30, 42 and 63
(f) 15, 20, 28 and 35​

Answer 1

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