Multiplication
Lesson
Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone


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.

Let's Practice!
click here

 
Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone

Created by Carol Carroll
Updated by Nicole Freebern
Copyright 2001-06 Oswego City School District