Subtract 12/40 from 8/84
8/84 - 12/40 is -43/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
8/84 = 8 × 10/84 × 10 = 80/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
12/40 = 12 × 21/40 × 21 = 252/840 - Subtract the two like fractions:
80/840 - 252/840 = 80 - 252/840 = -172/840 - After reducing the fraction, the answer is -43/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/84-12/40 8/84-24/40 8/84-12/80 24/84-12/40 8/84-36/40 40/84-12/40 8/84-60/40 56/84-12/40 8/84-84/40