Add 21/36 and 15/70
21/36 + 15/70 is 67/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 70 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 36 × 35 = 1260,
21/36 = 21 × 35/36 × 35 = 735/1260 - Likewise, for the 2nd fraction, since 70 × 18 = 1260,
15/70 = 15 × 18/70 × 18 = 270/1260 - Add the two like fractions:
735/1260 + 270/1260 = 735 + 270/1260 = 1005/1260 - 1005/1260 simplified gives 67/84
- So, 21/36 + 15/70 = 67/84
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