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Add 21/10 and 72/20

1st number: 2 1/10, 2nd number: 3 12/20

21/10 + 72/20 is 57/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 20 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 10 × 2 = 20,
    21/10 = 21 × 2/10 × 2 = 42/20
  3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
    72/20 = 72 × 1/20 × 1 = 72/20
  4. Add the two like fractions:
    42/20 + 72/20 = 42 + 72/20 = 114/20
  5. 114/20 simplified gives 57/10
  6. So, 21/10 + 72/20 = 57/10
    In mixed form: 57/10

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