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Add 3/72 and 42/70

3/72 + 42/70 is 77/120.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 70 is 2520
  2. For the 1st fraction, since 72 × 35 = 2520,
    3/72 = 3 × 35/72 × 35 = 105/2520
  3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
    42/70 = 42 × 36/70 × 36 = 1512/2520
  4. Add the two fractions:
    105/2520 + 1512/2520 = 105 + 1512/2520 = 1617/2520
  5. After reducing the fraction, the answer is 77/120

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