Subtract 1/21 from 42/30
1st number: 1 12/30, 2nd number: 1/21
42/30 - 1/21 is 142/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
1/21 = 1 × 10/21 × 10 = 10/210 - Subtract the two like fractions:
294/210 - 10/210 = 294 - 10/210 = 284/210 - After reducing the fraction, the answer is 142/105
- In mixed form: 137/105
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