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Add 20/45 and 21/63

20/45 + 21/63 is 7/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 63 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 45 × 7 = 315,
    20/45 = 20 × 7/45 × 7 = 140/315
  3. Likewise, for the 2nd fraction, since 63 × 5 = 315,
    21/63 = 21 × 5/63 × 5 = 105/315
  4. Add the two like fractions:
    140/315 + 105/315 = 140 + 105/315 = 245/315
  5. 245/315 simplified gives 7/9
  6. So, 20/45 + 21/63 = 7/9

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