3/12 is a quarter.
So Lisa had given one quarter (1/4) of her set of cars to her sister.
1/4 of her cars were given to her sister
Lisa gave her sister 4 1 of her set of toy cars. This is calculated by dividing the 3 cars she gave away by the total of 12 cars she initially had. The final fraction is simplified from 12 3 to 4 1 .
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