Subtract 21/4 from 1/90
1st number: 1/90, 2nd number: 5 1/4
1/90 - 21/4 is -943/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 4 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
1/90 = 1 × 2/90 × 2 = 2/180 - Likewise, for the 2nd fraction, since 4 × 45 = 180,
21/4 = 21 × 45/4 × 45 = 945/180 - Subtract the two like fractions:
2/180 - 945/180 = 2 - 945/180 = -943/180
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