Add 12/42 and 20/70
12/42 + 20/70 is 4/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
20/70 = 20 × 3/70 × 3 = 60/210 - Add the two like fractions:
60/210 + 60/210 = 60 + 60/210 = 120/210 - 120/210 simplified gives 4/7
- So, 12/42 + 20/70 = 4/7
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