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Add 20/63 and 35/45

20/63 + 35/45 is 23/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 63 and 45 is 315
  2. For the 1st fraction, since 63 × 5 = 315,
    20/63 = 20 × 5/63 × 5 = 100/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    35/45 = 35 × 7/45 × 7 = 245/315
  4. Add the two fractions:
    100/315 + 245/315 = 100 + 245/315 = 345/315
  5. 345/315 simplified gives 23/21
  6. So, 20/63 + 35/45 = 23/21
    In mixed form: 12/21

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