Subtract 21/42 from 50/40
1st number: 1 10/40, 2nd number: 21/42
50/40 - 21/42 is 3/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
50/40 = 50 × 21/40 × 21 = 1050/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
21/42 = 21 × 20/42 × 20 = 420/840 - Subtract the two like fractions:
1050/840 - 420/840 = 1050 - 420/840 = 630/840 - After reducing the fraction, the answer is 3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/80-21/42 50/40-21/84 50/40-63/42