Add 20/21 and 15/80
20/21 + 15/80 is 383/336.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
20/21 = 20 × 80/21 × 80 = 1600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
15/80 = 15 × 21/80 × 21 = 315/1680 - Add the two like fractions:
1600/1680 + 315/1680 = 1600 + 315/1680 = 1915/1680 - 1915/1680 simplified gives 383/336
- So, 20/21 + 15/80 = 383/336
In mixed form: 147/336
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