Add 12/21 and 63/70
12/21 + 63/70 is 103/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
12/21 = 12 × 10/21 × 10 = 120/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
63/70 = 63 × 3/70 × 3 = 189/210 - Add the two like fractions:
120/210 + 189/210 = 120 + 189/210 = 309/210 - 309/210 simplified gives 103/70
- So, 12/21 + 63/70 = 103/70
In mixed form: 133/70
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