Subtract 21/40 from 90/70
1st number: 1 20/70, 2nd number: 21/40
90/70 - 21/40 is 213/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
90/70 = 90 × 4/70 × 4 = 360/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
21/40 = 21 × 7/40 × 7 = 147/280 - Subtract the two like fractions:
360/280 - 147/280 = 360 - 147/280 = 213/280
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