Add 72/80 and 21/45
72/80 + 21/45 is 41/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
72/80 = 72 × 9/80 × 9 = 648/720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,
21/45 = 21 × 16/45 × 16 = 336/720 - Add the two like fractions:
648/720 + 336/720 = 648 + 336/720 = 984/720 - 984/720 simplified gives 41/30
- So, 72/80 + 21/45 = 41/30
In mixed form: 111/30
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