Subtract 30/40 from 8/16
8/16 - 30/40 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 40 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 16 × 5 = 80,
8/16 = 8 × 5/16 × 5 = 40/80 - Likewise, for the 2nd fraction, since 40 × 2 = 80,
30/40 = 30 × 2/40 × 2 = 60/80 - Subtract the two like fractions:
40/80 - 60/80 = 40 - 60/80 = -20/80 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/16-60/40 8/32-30/40 8/16-30/80 24/16-30/40 8/16-90/40 8/48-30/40 40/16-30/40 8/80-30/40 56/16-30/40