Subtract 9/20 from 63/42
1st number: 1 21/42, 2nd number: 9/20
63/42 - 9/20 is 21/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
63/42 = 63 × 10/42 × 10 = 630/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
9/20 = 9 × 21/20 × 21 = 189/420 - Subtract the two like fractions:
630/420 - 189/420 = 630 - 189/420 = 441/420 - After reducing the fraction, the answer is 21/20
- In mixed form: 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42-18/20 63/84-9/20 63/42-9/40 63/42-27/20 63/42-9/60 63/42-45/20 63/42-63/20