Subtract 28/42 from 25/45
25/45 - 28/42 is -1/9.
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,
28/42 = 28 × 15/42 × 15 = 420/630 - Subtract the two like fractions:
350/630 - 420/630 = 350 - 420/630 = -70/630 - After reducing the fraction, the answer is -1/9
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