Add 20/75 and 21/90
20/75 + 21/90 is 1/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 75 × 6 = 450,
20/75 = 20 × 6/75 × 6 = 120/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
21/90 = 21 × 5/90 × 5 = 105/450 - Add the two like fractions:
120/450 + 105/450 = 120 + 105/450 = 225/450 - 225/450 simplified gives 1/2
- So, 20/75 + 21/90 = 1/2
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