Add 21/70 and 15/21
21/70 + 15/21 is 71/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
15/21 = 15 × 10/21 × 10 = 150/210 - Add the two like fractions:
63/210 + 150/210 = 63 + 150/210 = 213/210 - 213/210 simplified gives 71/70
- So, 21/70 + 15/21 = 71/70
In mixed form: 11/70
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