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Add 2/5 and 21/8

1st number: 2/5, 2nd number: 2 5/8

2/5 + 21/8 is 121/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 8 is 40
  2. For the 1st fraction, since 5 × 8 = 40,
    2/5 = 2 × 8/5 × 8 = 16/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    21/8 = 21 × 5/8 × 5 = 105/40
  4. Add the two fractions:
    16/40 + 105/40 = 16 + 105/40 = 121/40
  5. So, 2/5 + 21/8 = 121/40
    In mixed form: 31/40

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