Subtract 70/18 from 70/81
1st number: 70/81, 2nd number: 3 16/18
70/81 - 70/18 is -245/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 18 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
70/81 = 70 × 2/81 × 2 = 140/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
70/18 = 70 × 9/18 × 9 = 630/162 - Subtract the two like fractions:
140/162 - 630/162 = 140 - 630/162 = -490/162 - After reducing the fraction, the answer is -245/81
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