Subtract 4/8 from 81/70, Solve 1 11/70

Subtract 4/8 from 81/70

1^st number: 1 11/70, 2^nd number: 4/8

81/70 - 4/8 is 23/35.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 8 is 280

Next, find the equivalent fraction of both fractional numbers with denominator 280
For the 1st fraction, since 70 × 4 = 280,
81/70 = 81 × 4/70 × 4 = 324/280
Likewise, for the 2nd fraction, since 8 × 35 = 280,
4/8 = 4 × 35/8 × 35 = 140/280
Subtract the two like fractions:
324/280 - 140/280 = 324 - 140/280 = 184/280
After reducing the fraction, the answer is 23/35

MathStep (Works offline)

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