Subtract 42/80 from 28/63
28/63 - 42/80 is -29/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 80 is 5040
Next, find the equivalent fraction of both fractional numbers with denominator 5040 - For the 1st fraction, since 63 × 80 = 5040,
28/63 = 28 × 80/63 × 80 = 2240/5040 - Likewise, for the 2nd fraction, since 80 × 63 = 5040,
42/80 = 42 × 63/80 × 63 = 2646/5040 - Subtract the two like fractions:
2240/5040 - 2646/5040 = 2240 - 2646/5040 = -406/5040 - After reducing the fraction, the answer is -29/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/63-42/80 28/63-84/80 84/63-42/80