Twice as many cats as dogs

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Twice as many cats as dogs (2 times as many)
Half as many dogs as cats (1/2 times as many)
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Four thirds as many boys as girls (4/3 times as
many)
Three quarters as many girls as boys (3/4 times
as many)
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To add two fractions

• If the denominators are the same, add the
  numerators.
• If not, make the denominators the same by
  multiplying the top and bottom by the same
  number.