Chapter 3


What are stategies to add

numbers to 20?

Count on : On a number line, start with the greater number and count up. 

Number line: A line with number labels.
 
Addends: Any numbers being added together.

Doubles: Two addends that are the same. 

Doubles minus 1: Add with doubles and subtract one. 

Double plus 1 : Add with doubles and add one.