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9,9
18
They are: 1*18 = 18, 2*9 = 18 and 3*6 = 18
3*6 = 18 types of sandwiches
18
9,9
Think of the chairs as arrays. The dimensions of the arrays give you the factors of 18.
18
13
18
You can have the 18 as prisms, OR.. they can be cut up into an infinite number of different prisms, as many as your tools for cutting it can make.
There are 4 of them.
18
18
How many inches make a size 18?
i think there are 18 different ways
You can see that multiplication works both ways: 2x9=18 9x2=18 5x9=45 9x5=45 Arrays are also helpful in seeing the inverse relationship between multiplication and division.