Subtract 42/80 from 21/6
1st number: 3 3/6, 2nd number: 42/80
21/6 - 42/80 is 119/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 6 × 40 = 240,
21/6 = 21 × 40/6 × 40 = 840/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
42/80 = 42 × 3/80 × 3 = 126/240 - Subtract the two like fractions:
840/240 - 126/240 = 840 - 126/240 = 714/240 - After reducing the fraction, the answer is 119/40
- In mixed form: 239/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-42/80 21/6-84/80 21/12-42/80 63/6-42/80 21/18-42/80 21/30-42/80 21/42-42/80