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Add 21/4 and 42/70

1st number: 5 1/4, 2nd number: 42/70

21/4 + 42/70 is 117/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 70 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 4 × 35 = 140,
    21/4 = 21 × 35/4 × 35 = 735/140
  3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
    42/70 = 42 × 2/70 × 2 = 84/140
  4. Add the two like fractions:
    735/140 + 84/140 = 735 + 84/140 = 819/140
  5. 819/140 simplified gives 117/20
  6. So, 21/4 + 42/70 = 117/20
    In mixed form: 517/20

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