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Find the prime factorisation of each number by factor tree method and division method.

(a) 60

(b) 128

(c) 144

(d) 198

(e) 420

(f) 999

1 Answer

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Best answer

(a) 60

∴ 60 = 2 × 2 × 3 × 5

Also

∴ 60 = 2 × 2 × 3 × 5

(b) 128

∴ 128 = 2 × 2 × 2 × 2 × 2 × 2 × 2

Also

∴ 128 = 2 × 2 × 2 × 2 × 2 × 2 × 2

(c) 144

∴ 144 = 2 × 2 × 2 × 2 × 3 × 3

Also

∴ 144 = 2 × 2 × 2 × 2 × 3 × 3

(d) 198

(e) 420

(f) 999

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