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Add 1/21 and 40/90

1/21 + 40/90 is 31/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 21 × 30 = 630,
    1/21 = 1 × 30/21 × 30 = 30/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    40/90 = 40 × 7/90 × 7 = 280/630
  4. Add the two like fractions:
    30/630 + 280/630 = 30 + 280/630 = 310/630
  5. 310/630 simplified gives 31/63
  6. So, 1/21 + 40/90 = 31/63

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