Subtract 21/18 from 63/35, Solve 1 28/35

Subtract 21/18 from 63/35

1^st number: 1 28/35, 2^nd number: 1 3/18

63/35 - 21/18 is 19/30.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 18 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 35 × 18 = 630,
63/35 = 63 × 18/35 × 18 = 1134/630
Likewise, for the 2nd fraction, since 18 × 35 = 630,
21/18 = 21 × 35/18 × 35 = 735/630
Subtract the two like fractions:
1134/630 - 735/630 = 1134 - 735/630 = 399/630
After reducing the fraction, the answer is 19/30

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