Add 15/40 and 42/70
15/40 + 42/70 is 39/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
15/40 = 15 × 7/40 × 7 = 105/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
42/70 = 42 × 4/70 × 4 = 168/280 - Add the two like fractions:
105/280 + 168/280 = 105 + 168/280 = 273/280 - 273/280 simplified gives 39/40
- So, 15/40 + 42/70 = 39/40
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