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Add 21/35 and 40/90

21/35 + 40/90 is 47/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 90 is 630
  2. For the 1st fraction, since 35 × 18 = 630,
    21/35 = 21 × 18/35 × 18 = 378/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    40/90 = 40 × 7/90 × 7 = 280/630
  4. Add the two fractions:
    378/630 + 280/630 = 378 + 280/630 = 658/630
  5. After reducing the fraction, the answer is 47/45
  6. In mixed form: 12/45

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