Subtract 4/40 from 70/90
70/90 - 4/40 is 61/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
70/90 = 70 × 4/90 × 4 = 280/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
4/40 = 4 × 9/40 × 9 = 36/360 - Subtract the two like fractions:
280/360 - 36/360 = 280 - 36/360 = 244/360 - After reducing the fraction, the answer is 61/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90-8/40 70/90-4/80 70/90-12/40 70/90-20/40 70/90-28/40