Add 18/20 and 21/36
18/20 + 21/36 is 89/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
21/36 = 21 × 5/36 × 5 = 105/180 - Add the two like fractions:
162/180 + 105/180 = 162 + 105/180 = 267/180 - 267/180 simplified gives 89/60
- So, 18/20 + 21/36 = 89/60
In mixed form: 129/60
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