Subtract 42/40 from 21/3
1st number: 7 0/3, 2nd number: 1 2/40
21/3 - 42/40 is 119/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 3 × 40 = 120,
21/3 = 21 × 40/3 × 40 = 840/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
42/40 = 42 × 3/40 × 3 = 126/120 - Subtract the two like fractions:
840/120 - 126/120 = 840 - 126/120 = 714/120 - After reducing the fraction, the answer is 119/20
- In mixed form: 519/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-42/40 21/3-84/40 21/6-42/40 21/3-42/80 63/3-42/40 21/9-42/40 21/15-42/40