Subtract 63/16 from 20/42
1st number: 20/42, 2nd number: 3 15/16
20/42 - 63/16 is -1163/336.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 42 × 8 = 336,
20/42 = 20 × 8/42 × 8 = 160/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
63/16 = 63 × 21/16 × 21 = 1323/336 - Subtract the two like fractions:
160/336 - 1323/336 = 160 - 1323/336 = -1163/336
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-63/16 20/84-63/16 20/42-63/32 60/42-63/16 20/42-63/48 20/42-63/80