Subtract 21/14 from 70/90
1st number: 70/90, 2nd number: 1 7/14
70/90 - 21/14 is -13/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 14 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
70/90 = 70 × 7/90 × 7 = 490/630 - Likewise, for the 2nd fraction, since 14 × 45 = 630,
21/14 = 21 × 45/14 × 45 = 945/630 - Subtract the two like fractions:
490/630 - 945/630 = 490 - 945/630 = -455/630 - After reducing the fraction, the answer is -13/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90-42/14 70/90-21/28 70/90-63/14 70/90-21/42 70/90-21/70 70/90-21/98