Multiple choice

Find the LCM of 44 and 90.

  1. 2

  2. 990

  3. 1890

  4. 1980
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D Correct answer
Explanation

Prime factorisation of 44 = 2 $\times$ 2 $\times$ 11 = 22 $\times$ 111 Prime factorisation of 90 = 2 $\times$ 3 $\times$ 3 $\times$ 5 = 21 $\times$ 32 $\times$ 51

$\therefore$  LCM (44, 90) = 22 $\times$ 32 $\times$ 51 $\times$ 111 = 4 $\times$ 9 $\times$ 5 $\times$ 11 = 1980

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