Subtract 21/70 from 36/42
36/42 - 21/70 is 39/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
36/42 = 36 × 5/42 × 5 = 180/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Subtract the two like fractions:
180/210 - 63/210 = 180 - 63/210 = 117/210 - After reducing the fraction, the answer is 39/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42-21/70 36/42-42/70 36/84-21/70 36/42-63/70