Subtract 12/80 from 8/42
8/42 - 12/80 is 17/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
8/42 = 8 × 40/42 × 40 = 320/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
12/80 = 12 × 21/80 × 21 = 252/1680 - Subtract the two like fractions:
320/1680 - 252/1680 = 320 - 252/1680 = 68/1680 - After reducing the fraction, the answer is 17/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/42-12/80 8/42-24/80 8/84-12/80 24/42-12/80 8/42-36/80 40/42-12/80 8/42-60/80 56/42-12/80 8/42-84/80