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Add 28/40 and 45/63

28/40 + 45/63 is 99/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 63 is 2520

    Next, find the equivalent fraction of both fractional numbers with denominator 2520
  2. For the 1st fraction, since 40 × 63 = 2520,
    28/40 = 28 × 63/40 × 63 = 1764/2520
  3. Likewise, for the 2nd fraction, since 63 × 40 = 2520,
    45/63 = 45 × 40/63 × 40 = 1800/2520
  4. Add the two like fractions:
    1764/2520 + 1800/2520 = 1764 + 1800/2520 = 3564/2520
  5. 3564/2520 simplified gives 99/70
  6. So, 28/40 + 45/63 = 99/70
    In mixed form: 129/70

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