Subtract 9/21 from 70/20
1st number: 3 10/20, 2nd number: 9/21
70/20 - 9/21 is 43/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
70/20 = 70 × 21/20 × 21 = 1470/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
9/21 = 9 × 20/21 × 20 = 180/420 - Subtract the two like fractions:
1470/420 - 180/420 = 1470 - 180/420 = 1290/420 - After reducing the fraction, the answer is 43/14
- In mixed form: 31/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/20-18/21 70/40-9/21 70/20-9/42 70/20-27/21 70/60-9/21 70/20-9/63 70/20-45/21 70/20-63/21