Subtract 3/45 from 90/70
1st number: 1 20/70, 2nd number: 3/45
90/70 - 3/45 is 128/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
90/70 = 90 × 9/70 × 9 = 810/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
3/45 = 3 × 14/45 × 14 = 42/630 - Subtract the two like fractions:
810/630 - 42/630 = 810 - 42/630 = 768/630 - After reducing the fraction, the answer is 128/105
- In mixed form: 123/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-6/45 90/70-3/90 90/70-9/45 90/70-15/45 90/70-21/45