Subtract 72/84 from 3/10
3/10 - 72/84 is -39/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 10 × 42 = 420,
3/10 = 3 × 42/10 × 42 = 126/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
72/84 = 72 × 5/84 × 5 = 360/420 - Subtract the two like fractions:
126/420 - 360/420 = 126 - 360/420 = -234/420 - After reducing the fraction, the answer is -39/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10-72/84 3/20-72/84 9/10-72/84 3/30-72/84 15/10-72/84 3/50-72/84 21/10-72/84 3/70-72/84