Subtract 3/63 from 75/70, Solve 1 5/70

Subtract 3/63 from 75/70

1^st number: 1 5/70, 2^nd number: 3/63

75/70 - 3/63 is 43/42.

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,
75/70 = 75 × 9/70 × 9 = 675/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
3/63 = 3 × 10/63 × 10 = 30/630
Subtract the two like fractions:
675/630 - 30/630 = 675 - 30/630 = 645/630
After reducing the fraction, the answer is 43/42
In mixed form: 11/42

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad