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Add 20/21 and 35/40

20/21 + 35/40 is 307/168.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    20/21 = 20 × 40/21 × 40 = 800/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    35/40 = 35 × 21/40 × 21 = 735/840
  4. Add the two fractions:
    800/840 + 735/840 = 800 + 735/840 = 1535/840
  5. After reducing the fraction, the answer is 307/168
  6. In mixed form: 1139/168

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