Subtract 70/9 from 25/21
1st number: 1 4/21, 2nd number: 7 7/9
25/21 - 70/9 is -415/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
25/21 = 25 × 3/21 × 3 = 75/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
70/9 = 70 × 7/9 × 7 = 490/63 - Subtract the two like fractions:
75/63 - 490/63 = 75 - 490/63 = -415/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21-70/9 25/42-70/9 25/21-70/18 75/21-70/9 25/63-70/9 25/21-70/27 25/21-70/45 25/21-70/63