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Add 21/40 and 35/72

21/40 + 35/72 is 91/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 40 × 9 = 360,
    21/40 = 21 × 9/40 × 9 = 189/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    35/72 = 35 × 5/72 × 5 = 175/360
  4. Add the two like fractions:
    189/360 + 175/360 = 189 + 175/360 = 364/360
  5. 364/360 simplified gives 91/90
  6. So, 21/40 + 35/72 = 91/90
    In mixed form: 11/90

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