Subtract 30/3 from 42/70
1st number: 42/70, 2nd number: 10 0/3
42/70 - 30/3 is -47/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 3 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
42/70 = 42 × 3/70 × 3 = 126/210 - Likewise, for the 2nd fraction, since 3 × 70 = 210,
30/3 = 30 × 70/3 × 70 = 2100/210 - Subtract the two like fractions:
126/210 - 2100/210 = 126 - 2100/210 = -1974/210 - After reducing the fraction, the answer is -47/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70-30/3 42/70-60/3 42/70-30/6 42/70-90/3 42/70-30/9 42/70-30/15 42/70-30/21