use the prime factorisation method find the lcm of 21, 28, 36, 45,
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Answered by
4
by using factorisation method
21 = 3 × 7
28 = 2 × 2 × 7
36 = 2 × 2 × 3 × 3
and
45 = 3 × 3 × 5
hence the lcm is
2^2 × 3^2 × 5 × 7
= 4 × 9 × 5 × 7
= 36 × 35
= 1260
21 = 3 × 7
28 = 2 × 2 × 7
36 = 2 × 2 × 3 × 3
and
45 = 3 × 3 × 5
hence the lcm is
2^2 × 3^2 × 5 × 7
= 4 × 9 × 5 × 7
= 36 × 35
= 1260
Answered by
2
21 = 3×7
28 = 2×2×7
36 = 3×3×4
45 =5×3×3
28 = 2×2×7
36 = 3×3×4
45 =5×3×3
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