Add 20/28 and 12/90
20/28 + 12/90 is 89/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
20/28 = 20 × 45/28 × 45 = 900/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
12/90 = 12 × 14/90 × 14 = 168/1260 - Add the two like fractions:
900/1260 + 168/1260 = 900 + 168/1260 = 1068/1260 - 1068/1260 simplified gives 89/105
- So, 20/28 + 12/90 = 89/105
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