Subtract 72/63 from 42/80
1st number: 42/80, 2nd number: 1 9/63
42/80 - 72/63 is -173/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 63 is 5040
Next, find the equivalent fraction of both fractional numbers with denominator 5040 - For the 1st fraction, since 80 × 63 = 5040,
42/80 = 42 × 63/80 × 63 = 2646/5040 - Likewise, for the 2nd fraction, since 63 × 80 = 5040,
72/63 = 72 × 80/63 × 80 = 5760/5040 - Subtract the two like fractions:
2646/5040 - 5760/5040 = 2646 - 5760/5040 = -3114/5040 - After reducing the fraction, the answer is -173/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80-72/63