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Fractions can only be added/subtracted if they have the same denominator (like fractions); fractions in the same family (related fractions) can be added or subtracted by renaming the parts. (E.g. to subtract 4 ninths from 2 thirds. 2/3s needs to be renamed as 6 ninths.)
Activity 1: Play this online game
Activity 2: Equivalent Fractions Game
Activity 3: Pick 5 different fractions and rename them in different ways. Pick fractions that will challenge you
E.g 1/2 is the same as 2/5 and 50%
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