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Add 27/21 and 70/40

1st number: 1 6/21, 2nd number: 1 30/40

27/21 + 70/40 is 85/28.

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,
    27/21 = 27 × 40/21 × 40 = 1080/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    70/40 = 70 × 21/40 × 21 = 1470/840
  4. Add the two fractions:
    1080/840 + 1470/840 = 1080 + 1470/840 = 2550/840
  5. 2550/840 simplified gives 85/28
  6. So, 27/21 + 70/40 = 85/28
    In mixed form: 31/28

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