Subtract 45/10 from 50/21, Solve 2 8/21

Subtract 45/10 from 50/21

1^st number: 2 8/21, 2^nd number: 4 5/10

50/21 - 45/10 is -89/42.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 21 × 10 = 210,
50/21 = 50 × 10/21 × 10 = 500/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
45/10 = 45 × 21/10 × 21 = 945/210
Subtract the two like fractions:
500/210 - 945/210 = 500 - 945/210 = -445/210
After reducing the fraction, the answer is -89/42

MathStep (Works offline)

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