Subtract 14/40 from 25/21, Solve 1 4/21

Subtract 14/40 from 25/21

1^st number: 1 4/21, 2^nd number: 14/40

25/21 - 14/40 is 353/420.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 21 × 40 = 840,
25/21 = 25 × 40/21 × 40 = 1000/840
Likewise, for the 2nd fraction, since 40 × 21 = 840,
14/40 = 14 × 21/40 × 21 = 294/840
Subtract the two like fractions:
1000/840 - 294/840 = 1000 - 294/840 = 706/840
After reducing the fraction, the answer is 353/420

MathStep (Works offline)

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