Subtract 84/72 from 90/70
1st number: 1 20/70, 2nd number: 1 12/72
90/70 - 84/72 is 5/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 70 × 36 = 2520,
90/70 = 90 × 36/70 × 36 = 3240/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
84/72 = 84 × 35/72 × 35 = 2940/2520 - Subtract the two like fractions:
3240/2520 - 2940/2520 = 3240 - 2940/2520 = 300/2520 - After reducing the fraction, the answer is 5/42
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