Subtract 90/70 from 6/45
1st number: 6/45, 2nd number: 1 20/70
6/45 - 90/70 is -121/105.
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,
6/45 = 6 × 14/45 × 14 = 84/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
90/70 = 90 × 9/70 × 9 = 810/630 - Subtract the two like fractions:
84/630 - 810/630 = 84 - 810/630 = -726/630 - After reducing the fraction, the answer is -121/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/45-90/70 6/90-90/70 18/45-90/70 30/45-90/70 42/45-90/70