Subtract 54/80 from 4/90
4/90 - 54/80 is -227/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
4/90 = 4 × 8/90 × 8 = 32/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
54/80 = 54 × 9/80 × 9 = 486/720 - Subtract the two like fractions:
32/720 - 486/720 = 32 - 486/720 = -454/720 - After reducing the fraction, the answer is -227/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/90-54/80 12/90-54/80 20/90-54/80 28/90-54/80