Subtract 81/70 from 1/45
1st number: 1/45, 2nd number: 1 11/70
1/45 - 81/70 is -143/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
1/45 = 1 × 14/45 × 14 = 14/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630 - Subtract the two like fractions:
14/630 - 729/630 = 14 - 729/630 = -715/630 - After reducing the fraction, the answer is -143/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/45-81/70 1/90-81/70 3/45-81/70 5/45-81/70 7/45-81/70