Add 72/21 and 40/54
1st number: 3 9/21, 2nd number: 40/54
72/21 + 40/54 is 788/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
72/21 = 72 × 18/21 × 18 = 1296/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
40/54 = 40 × 7/54 × 7 = 280/378 - Add the two like fractions:
1296/378 + 280/378 = 1296 + 280/378 = 1576/378 - 1576/378 simplified gives 788/189
- So, 72/21 + 40/54 = 788/189
In mixed form: 432/189
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