49 = 7 x 7, 21 = 7 x 3, 91 = 7 x 13.
HCF is 7
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14 = 7 x 2 & 49 = 7 x 7 '7' is common to both numbers, so seven is the HCF ( Highest common factor).
Multiples 21: 1,3,7,21Multiples 49: 1,7,49
Highest Common Factor is 7 : 7 x 5 = 35 ; 7 x 7 = 49
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98.
The multiples of 7 from 7 to 100 are ...... 0, 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105.