MEASURE UP!® Cups by Discovery Toys from when the kids were babies. They are each marked with a number and are proportional. I gave my son the 3 cup and 5 cup, some water and an empty glass.
First he filled the three cup and then filled 1/5 of the 5 cup. I wrote what he did on paper for him.
3 + 5(1/5) = 5
Next he filled the 5 cup and used the water in the 5 cup to fill the 3 cup so he was left with 2 in the five cup. He saved one-half of the water and added it to the 3 cup. Again I wrote his solution.
(5-3)/2 + 3 = 4
I let him think about it over night and in the morning he came up with a third solution. He filled the 5 cup and used the water in the 5 cup to fill the 3 cup so he was left with 2 in the 5 cup. He saved the 2 and repeated the process so that he had 4.
2 x (5-3) = 4
There are many more hands-on math activities on our Math Page.
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