Subtract 21/42 from 18/6
1st number: 3 0/6, 2nd number: 21/42
18/6 - 21/42 is 5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
18/6 = 18 × 7/6 × 7 = 126/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Subtract the two like fractions:
126/42 - 21/42 = 126 - 21/42 = 105/42 - After reducing the fraction, the answer is 5/2
- In mixed form: 21/2
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