Subtract 50/40 from 21/12
1st number: 1 9/12, 2nd number: 1 10/40
21/12 - 50/40 is 1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 12 × 10 = 120,
21/12 = 21 × 10/12 × 10 = 210/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
50/40 = 50 × 3/40 × 3 = 150/120 - Subtract the two like fractions:
210/120 - 150/120 = 210 - 150/120 = 60/120 - After reducing the fraction, the answer is 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-50/40 21/24-50/40 21/12-50/80 63/12-50/40 21/36-50/40 21/60-50/40 21/84-50/40