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Add 21/36 and 42/70

21/36 + 42/70 is 71/60.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 70 is 1260
  2. For the 1st fraction, since 36 × 35 = 1260,
    21/36 = 21 × 35/36 × 35 = 735/1260
  3. Likewise, for the 2nd fraction, since 70 × 18 = 1260,
    42/70 = 42 × 18/70 × 18 = 756/1260
  4. Add the two fractions:
    735/1260 + 756/1260 = 735 + 756/1260 = 1491/1260
  5. After reducing the fraction, the answer is 71/60
  6. In mixed form: 111/60

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