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Add 21/72 and 42/70

21/72 + 42/70 is 107/120.

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,
    21/72 = 21 × 35/72 × 35 = 735/2520
  3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
    42/70 = 42 × 36/70 × 36 = 1512/2520
  4. Add the two fractions:
    735/2520 + 1512/2520 = 735 + 1512/2520 = 2247/2520
  5. 2247/2520 simplified gives 107/120
  6. So, 21/72 + 42/70 = 107/120

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