| A | B |
| array | an arrangement of objects into rows of equal length and columns of equal length |
| product | the answer to a multiplication problem |
| multiplication | the oepration of two numbers that can be thought of as repeated addition |
| factor | a number multiplied by another number |
| multiply | put equal groups together |
| Commutative Property | the order in which numbers are multiplied does not change the product |
| tree diagram | uses "branches" to show all possible combinations |
| combination | make a new set that has one item from each group |
| equal groups | have the same number of objects in each group |