Add 18/21 and 25/28
18/21 + 25/28 is 7/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 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 28 × 3 = 84,
25/28 = 25 × 3/28 × 3 = 75/84 - Add the two like fractions:
72/84 + 75/84 = 72 + 75/84 = 147/84 - 147/84 simplified gives 7/4
- So, 18/21 + 25/28 = 7/4
In mixed form: 13/4
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