Question

Our
on
or,
1. Express each number as a product of its prime factors:
(i) 140
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
(iii) 336 and 54
3. Find the LCM and HCF of the following integers by applying the prime factorisation
method.
(i) 12, 15 and 21 (ii) 17, 23 and 29
(iii) 8,9 and 25
0)
5
TOT
1 Т​

Answer 1

Answer:

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Answer 2

:

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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