Subtract 9/70 from 12/21
12/21 - 9/70 is 31/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
12/21 = 12 × 10/21 × 10 = 120/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
9/70 = 9 × 3/70 × 3 = 27/210 - Subtract the two like fractions:
120/210 - 27/210 = 120 - 27/210 = 93/210 - After reducing the fraction, the answer is 31/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-9/70 12/21-18/70 12/42-9/70 36/21-9/70 12/21-27/70 12/63-9/70 60/21-9/70 12/21-45/70 84/21-9/70 12/21-63/70