Subtract 4/64 from 21/10, Solve 2 1/10

Subtract 4/64 from 21/10

1^st number: 2 1/10, 2^nd number: 4/64

21/10 - 4/64 is 163/80.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 64 is 320

Next, find the equivalent fraction of both fractional numbers with denominator 320
For the 1st fraction, since 10 × 32 = 320,
21/10 = 21 × 32/10 × 32 = 672/320
Likewise, for the 2nd fraction, since 64 × 5 = 320,
4/64 = 4 × 5/64 × 5 = 20/320
Subtract the two like fractions:
672/320 - 20/320 = 672 - 20/320 = 652/320
After reducing the fraction, the answer is 163/80
In mixed form: 23/80

MathStep (Works offline)

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