Subtract 30/40 from 21/6
1st number: 3 3/6, 2nd number: 30/40
21/6 - 30/40 is 11/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 6 × 20 = 120,
21/6 = 21 × 20/6 × 20 = 420/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
30/40 = 30 × 3/40 × 3 = 90/120 - Subtract the two like fractions:
420/120 - 90/120 = 420 - 90/120 = 330/120 - After reducing the fraction, the answer is 11/4
- In mixed form: 23/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-30/40 21/6-60/40 21/12-30/40 21/6-30/80 63/6-30/40 21/6-90/40 21/18-30/40 21/30-30/40 21/42-30/40