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Add 1/21 and 20/45

1/21 + 20/45 is 31/63.

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,
    1/21 = 1 × 15/21 × 15 = 15/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    20/45 = 20 × 7/45 × 7 = 140/315
  4. Add the two fractions:
    15/315 + 140/315 = 15 + 140/315 = 155/315
  5. 155/315 simplified gives 31/63
  6. So, 1/21 + 20/45 = 31/63

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