Subtract 3/10 from 28/42
28/42 - 3/10 is 11/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
28/42 = 28 × 5/42 × 5 = 140/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
3/10 = 3 × 21/10 × 21 = 63/210 - Subtract the two like fractions:
140/210 - 63/210 = 140 - 63/210 = 77/210 - After reducing the fraction, the answer is 11/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-3/10 28/42-6/10 28/84-3/10 28/42-3/20 84/42-3/10 28/42-9/10 28/42-3/30 28/42-15/10 28/42-3/50 28/42-21/10 28/42-3/70