Subtract 63/21 from 8/40
1st number: 8/40, 2nd number: 3 0/21
8/40 - 63/21 is -14/5.
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,
8/40 = 8 × 21/40 × 21 = 168/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
63/21 = 63 × 40/21 × 40 = 2520/840 - Subtract the two like fractions:
168/840 - 2520/840 = 168 - 2520/840 = -2352/840 - After reducing the fraction, the answer is -14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/40-63/21 8/80-63/21 8/40-63/42 24/40-63/21 56/40-63/21