Subtract 3/80 from 63/42
1st number: 1 21/42, 2nd number: 3/80
63/42 - 3/80 is 117/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
63/42 = 63 × 40/42 × 40 = 2520/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
3/80 = 3 × 21/80 × 21 = 63/1680 - Subtract the two like fractions:
2520/1680 - 63/1680 = 2520 - 63/1680 = 2457/1680 - After reducing the fraction, the answer is 117/80
- In mixed form: 137/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42-6/80 63/84-3/80 63/42-9/80 63/42-15/80 63/42-21/80