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Add 80/90 and 21/64

80/90 + 21/64 is 701/576.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 64 is 2880

    Next, find the equivalent fraction of both fractional numbers with denominator 2880
  2. For the 1st fraction, since 90 × 32 = 2880,
    80/90 = 80 × 32/90 × 32 = 2560/2880
  3. Likewise, for the 2nd fraction, since 64 × 45 = 2880,
    21/64 = 21 × 45/64 × 45 = 945/2880
  4. Add the two like fractions:
    2560/2880 + 945/2880 = 2560 + 945/2880 = 3505/2880
  5. 3505/2880 simplified gives 701/576
  6. So, 80/90 + 21/64 = 701/576
    In mixed form: 1125/576

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