Subtract 30/9 from 72/70
1st number: 1 2/70, 2nd number: 3 3/9
72/70 - 30/9 is -242/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 9 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
72/70 = 72 × 9/70 × 9 = 648/630 - Likewise, for the 2nd fraction, since 9 × 70 = 630,
30/9 = 30 × 70/9 × 70 = 2100/630 - Subtract the two like fractions:
648/630 - 2100/630 = 648 - 2100/630 = -1452/630 - After reducing the fraction, the answer is -242/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70-60/9 72/70-30/18 72/70-90/9 72/70-30/27 72/70-30/45 72/70-30/63