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Add 21/42 and 9/45

21/42 + 9/45 is 7/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 45 is 630
  2. For the 1st fraction, since 42 × 15 = 630,
    21/42 = 21 × 15/42 × 15 = 315/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    9/45 = 9 × 14/45 × 14 = 126/630
  4. Add the two fractions:
    315/630 + 126/630 = 315 + 126/630 = 441/630
  5. After reducing the fraction, the answer is 7/10

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