Add 15/21 and 40/56
15/21 + 40/56 is 10/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
15/21 = 15 × 8/21 × 8 = 120/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
40/56 = 40 × 3/56 × 3 = 120/168 - Add the two like fractions:
120/168 + 120/168 = 120 + 120/168 = 240/168 - 240/168 simplified gives 10/7
- So, 15/21 + 40/56 = 10/7
In mixed form: 13/7
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