Subtract 84/21 from 2/5
1st number: 2/5, 2nd number: 4 0/21
2/5 - 84/21 is -18/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
2/5 = 2 × 21/5 × 21 = 42/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
84/21 = 84 × 5/21 × 5 = 420/105 - Subtract the two like fractions:
42/105 - 420/105 = 42 - 420/105 = -378/105 - After reducing the fraction, the answer is -18/5
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