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Add 30/21 and 40/90

1st number: 1 9/21, 2nd number: 40/90

30/21 + 40/90 is 118/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630
  2. For the 1st fraction, since 21 × 30 = 630,
    30/21 = 30 × 30/21 × 30 = 900/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    40/90 = 40 × 7/90 × 7 = 280/630
  4. Add the two fractions:
    900/630 + 280/630 = 900 + 280/630 = 1180/630
  5. 1180/630 simplified gives 118/63
  6. So, 30/21 + 40/90 = 118/63
    In mixed form: 155/63

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