1. Express each number as a product of its prime factors:
(i) 140
(ii) 156
(ii) 3825
(iv) 5005
(v) 7429
2. Find the LCM and HCF of the following pairs of integers and verify that LCM HCF =
product of the two numbers.
(i) 26 and 91
(ii) 510 and 92
(ii) 336 and 54
3. Find the LCM and HCF of the following integers by applying the prime factorisation
method.
(1) 12,15 and 21 (ii) 17,23 and 29
(iii) 8, 9 and 25
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(i) 140
140=2×70
=2×2×35
=2×2×5×7
=2×2×5×7×1
(ii) 156
156=2×78
=2×2×39
=2×2×3×13
=2×2×3×13×1
(iii) 3825
3825=3×1275
=3×3×425
=3×3×5×85
=3×3×5×5×17
=3×3×5×5×17×1
(iv) 5005
5005=5×1001
=5×7×143
=5×7×11×13
=5×7×11×13×1
(v) 7429
7429=17×437
=17×19×23
=17×19×23×1(i) 140
140=2×70
=2×2×35
=2×2×5×7
=2×2×5×7×1
(ii) 156
156=2×78
=2×2×39
=2×2×3×13
=2×2×3×13×1
(iii) 3825
3825=3×1275
=3×3×425
=3×3×5×85
=3×3×5×5×17
=3×3×5×5×17×1
(iv) 5005
5005=5×1001
=5×7×143
=5×7×11×13
=5×7×11×13×1
(v) 7429
7429=17×437
=17×19×23
=17×19×23×1
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