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Add 21/40 and 54/70

21/40 + 54/70 is 363/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 70 is 280
  2. For the 1st fraction, since 40 × 7 = 280,
    21/40 = 21 × 7/40 × 7 = 147/280
  3. Likewise, for the 2nd fraction, since 70 × 4 = 280,
    54/70 = 54 × 4/70 × 4 = 216/280
  4. Add the two fractions:
    147/280 + 216/280 = 147 + 216/280 = 363/280
  5. In mixed form: 183/280

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