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Add 21/35 and 4/20

21/35 + 4/20 is 4/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 20 is 140
  2. For the 1st fraction, since 35 × 4 = 140,
    21/35 = 21 × 4/35 × 4 = 84/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    4/20 = 4 × 7/20 × 7 = 28/140
  4. Add the two fractions:
    84/140 + 28/140 = 84 + 28/140 = 112/140
  5. 112/140 simplified gives 4/5
  6. So, 21/35 + 4/20 = 4/5

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