Add 18/21 and 3/4
18/21 + 3/4 is 45/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
3/4 = 3 × 21/4 × 21 = 63/84 - Add the two like fractions:
72/84 + 63/84 = 72 + 63/84 = 135/84 - 135/84 simplified gives 45/28
- So, 18/21 + 3/4 = 45/28
In mixed form: 117/28
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