Page 18 - 6-Math-3 FACTORS AND MULTIPLES

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It can be seen the HCF of 1078 and 1353 is 11. Consider this HCF
of two numbers as divisor and the smallest of three numbers as
dividend.

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Thus, HCF of 1353, 979 and 1078 is 11.

version: 1.1 EXERCISE 3.4

1. Find all the common factors.
(i) 6 and 10 (ii) 8 and 12 (iii) 10 and 15
(vi) 28 and 36 (v) 20 and 30 (iv) 12 and 18

2. Find HCF by writing the common factors of each number.
(i) 24, 36 (ii) 25, 45 (iii) 21, 49
(iv) 12, 33 (v) 39, 52 (vi) 16, 20
(vii) 4,6,10 (viii) 22, 44, 66 (ix) 35, 20, 45

3. Find the HCF of following numbers, using the prime
factorization method.
(i) 12, 18 (ii) 22, 55 (iii) 36, 54
(iv) 24, 48 (v) 22, 132 (vi) 60, 72
(vii) 16, 54, 84 (viii) 22, 55, 110 (ix) 56, 189, 175

4. Find the HCF of the following numbers, using the long division
method.
(i) 72, 184 (ii) 63. 112 (iii) 276, 161
(iv) 314, 334 (v) 405, 513 (vi) 128, 340
(vii) 234, 538, 678 (viii) 155, 341, 1302 (ix) 399, 665, 1463

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