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Add 42/70 and 15/40

42/70 + 15/40 is 39/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 40 is 280

    Next, find the equivalent fraction of both fractional numbers with denominator 280
  2. For the 1st fraction, since 70 × 4 = 280,
    42/70 = 42 × 4/70 × 4 = 168/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    15/40 = 15 × 7/40 × 7 = 105/280
  4. Add the two like fractions:
    168/280 + 105/280 = 168 + 105/280 = 273/280
  5. 273/280 simplified gives 39/40
  6. So, 42/70 + 15/40 = 39/40

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