Subtract 12/42 from 25/45
25/45 - 12/42 is 17/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
25/45 = 25 × 14/45 × 14 = 350/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
12/42 = 12 × 15/42 × 15 = 180/630 - Subtract the two like fractions:
350/630 - 180/630 = 350 - 180/630 = 170/630 - After reducing the fraction, the answer is 17/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/45-12/42 25/45-24/42 25/90-12/42 25/45-12/84 75/45-12/42 25/45-36/42 25/45-60/42 25/45-84/42