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Add 21/70 and 15/40

21/70 + 15/40 is 27/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 40 is 280
  2. For the 1st fraction, since 70 × 4 = 280,
    21/70 = 21 × 4/70 × 4 = 84/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    15/40 = 15 × 7/40 × 7 = 105/280
  4. Add the two fractions:
    84/280 + 105/280 = 84 + 105/280 = 189/280
  5. After reducing the fraction, the answer is 27/40

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