Here is a trick I learned many, many years ago for teaching the commutative property of addition (which says that the order of the addends doesn't matter because the sum will remain the same, i.e. 2+3 = 3+2):

You need a hanger and some clothespins. Draw a plus sign on one clothespin and clip it to the center of the hanger. Then put a few clothespins on one side of the plus sign and a few on the other. State your addition problem (such as 2+3). Ask the child the answer. Then turn the hanger around and show that the problem is now rearranged (3+2). Ask the child the answer. Use this concrete visual to explain the commutative property of addition!

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