Subtract 6/63 from 81/70, Solve 1 11/70

Subtract 6/63 from 81/70

1^st number: 1 11/70, 2^nd number: 6/63

81/70 - 6/63 is 223/210.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 63 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
6/63 = 6 × 10/63 × 10 = 60/630
Subtract the two like fractions:
729/630 - 60/630 = 729 - 60/630 = 669/630
After reducing the fraction, the answer is 223/210
In mixed form: 113/210

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