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Examples of things that can come in groups of 9 include baseball innings, players on a baseball team, squares on a tic-tac-toe board, or planets in our solar system. Additionally, a standard deck of playing cards contains 4 sets of 9 numbered cards.
You can make three different groups of three out of nine. 9/3=3
9x9=81
If, by "equal groups", you mean groups of equal things, you get how many in all [the total number] by simply addingthem all together. Sometimes adding is called summation.If, by "equal groups", you mean equal-sized groups of things, you get how many in all by multiplying the number of groups by the number of things in each member group.The number of things in a group is also called its cardinality. Loosely, cardinality is the size of the group, or the number of elements ["things"] in the group.
9