Subtract 45/10 from 9/42
1st number: 9/42, 2nd number: 4 5/10
9/42 - 45/10 is -30/7.
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,
9/42 = 9 × 5/42 × 5 = 45/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
45/10 = 45 × 21/10 × 21 = 945/210 - Subtract the two like fractions:
45/210 - 945/210 = 45 - 945/210 = -900/210 - After reducing the fraction, the answer is -30/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42-45/10 9/42-90/10 9/84-45/10 9/42-45/20 27/42-45/10 9/42-45/30 45/42-45/10 9/42-45/50 63/42-45/10 9/42-45/70