Subtract 70/90 from 4/45
4/45 - 70/90 is -31/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
4/45 = 4 × 2/45 × 2 = 8/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
70/90 = 70 × 1/90 × 1 = 70/90 - Subtract the two like fractions:
8/90 - 70/90 = 8 - 70/90 = -62/90 - After reducing the fraction, the answer is -31/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/45-70/90 4/90-70/90 12/45-70/90 20/45-70/90 28/45-70/90