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Add 20/21 and 16/45

20/21 + 16/45 is 412/315.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315
  2. For the 1st fraction, since 21 × 15 = 315,
    20/21 = 20 × 15/21 × 15 = 300/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    16/45 = 16 × 7/45 × 7 = 112/315
  4. Add the two fractions:
    300/315 + 112/315 = 300 + 112/315 = 412/315
  5. In mixed form: 197/315

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