Subtract 42/70 from 3/30
3/30 - 42/70 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
3/30 = 3 × 7/30 × 7 = 21/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
42/70 = 42 × 3/70 × 3 = 126/210 - Subtract the two like fractions:
21/210 - 126/210 = 21 - 126/210 = -105/210 - After reducing the fraction, the answer is -1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30-42/70 3/30-84/70 3/60-42/70 9/30-42/70 3/90-42/70 15/30-42/70 21/30-42/70