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Add 21/98 and 40/90

21/98 + 40/90 is 83/126.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 98 and 90 is 4410
  2. For the 1st fraction, since 98 × 45 = 4410,
    21/98 = 21 × 45/98 × 45 = 945/4410
  3. Likewise, for the 2nd fraction, since 90 × 49 = 4410,
    40/90 = 40 × 49/90 × 49 = 1960/4410
  4. Add the two fractions:
    945/4410 + 1960/4410 = 945 + 1960/4410 = 2905/4410
  5. After reducing the fraction, the answer is 83/126

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