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The method of reduction is based on comparing the sizes of the problem with the same size.
In 6 identical boxes there are 30 video games. How many video games are in 4 boxes?
6 boxes ........ 30 video games
1 box ........ 30 : 6 = 5 video games
5 boxes ........ 5 x 4 = 20 video games
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