Subtract 12/45 from 2/42
2/42 - 12/45 is -23/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
2/42 = 2 × 15/42 × 15 = 30/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
12/45 = 12 × 14/45 × 14 = 168/630 - Subtract the two like fractions:
30/630 - 168/630 = 30 - 168/630 = -138/630 - After reducing the fraction, the answer is -23/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/42-12/45 2/42-24/45 2/84-12/45 2/42-12/90 6/42-12/45 2/42-36/45 10/42-12/45 2/42-60/45 14/42-12/45 2/42-84/45