Subtract 42/21 from 70/50
1st number: 1 20/50, 2nd number: 2 0/21
70/50 - 42/21 is -3/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 21 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 50 × 21 = 1050,
70/50 = 70 × 21/50 × 21 = 1470/1050 - Likewise, for the 2nd fraction, since 21 × 50 = 1050,
42/21 = 42 × 50/21 × 50 = 2100/1050 - Subtract the two like fractions:
1470/1050 - 2100/1050 = 1470 - 2100/1050 = -630/1050 - After reducing the fraction, the answer is -3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/50-84/21 70/50-42/63