Add 72/21 and 40/36
1st number: 3 9/21, 2nd number: 1 4/36
72/21 + 40/36 is 286/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
72/21 = 72 × 12/21 × 12 = 864/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
40/36 = 40 × 7/36 × 7 = 280/252 - Add the two like fractions:
864/252 + 280/252 = 864 + 280/252 = 1144/252 - 1144/252 simplified gives 286/63
- So, 72/21 + 40/36 = 286/63
In mixed form: 434/63
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