Elementary Test Prep: Math 4 Test (Grades 3-4) Use multiplicaiton sentences in equality and inequality.

In a multiplication sentence, the numbers being multiplied are the factors; the answer is the product.
2 x 5 = 10
factors (2, 5)		product (10)

When groups are not equal, you add to find how many.	2 + 1 = 3 multiply: cannot
When groups are equal, you can add or multiply.	2 + 2 = 4 or 2 x 2 = 4
Example: Not Equal Groups Serena bought 3 packages of batteries. Two packages had 2 batteries each. The third package had 3 batteries. How many batteries did Serena buy?
	Equal groups? no Add: 2 + 2 + 3 = 7 Multiply: cannot

Example: Equal Groups Kevin bought 3 packages of batteries. There were 2 batteries in each package. How many batteries did he buy?
	Equal groups? yes Add: 2 + 2 + 2 = 6 Multiply: 3 x 2 = 6

When you put together equal groups, you an use repeated addition.

4 + 4 = 8

2 rows of 4 equals 8

2 x 4 = 8 multiplication sentence

Using counters with unequal groups.

Equal groups? no

Add: 1 + 2 + 3 = 6

Multiply: cannot

Remember: When you are putting together equal groups, you can add or multiply.

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