Subtract 5/21 from 6/40
6/40 - 5/21 is -37/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
6/40 = 6 × 21/40 × 21 = 126/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
5/21 = 5 × 40/21 × 40 = 200/840 - Subtract the two like fractions:
126/840 - 200/840 = 126 - 200/840 = -74/840 - After reducing the fraction, the answer is -37/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/40-5/21 6/40-10/21 6/80-5/21 6/40-5/42 18/40-5/21 6/40-15/21 6/40-5/63 30/40-5/21 6/40-25/21 42/40-5/21 6/40-35/21