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Add 21/48 and 42/70

21/48 + 42/70 is 83/80.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 48 and 70 is 1680
  2. For the 1st fraction, since 48 × 35 = 1680,
    21/48 = 21 × 35/48 × 35 = 735/1680
  3. Likewise, for the 2nd fraction, since 70 × 24 = 1680,
    42/70 = 42 × 24/70 × 24 = 1008/1680
  4. Add the two fractions:
    735/1680 + 1008/1680 = 735 + 1008/1680 = 1743/1680
  5. 1743/1680 simplified gives 83/80
  6. So, 21/48 + 42/70 = 83/80
    In mixed form: 13/80

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