Addition & Subtraction:
Problem-Solving Tricks!
Take-Away Model
-Start with a number of objects and take objects away to find how many will be left.
Set Model of Addition/Subtraction
-Draw a picture to show "how
many".
Comparison Model
-Compare collections and how
many items are counted in
them.
Measurement Model of Addition/Subtraction
-Draw a number line to add or subtract distances and reach the final answer.
Missing-Addend Model
-Start with a number of
objects and find out how
many more need to be
added or subtracted to get
to the answer.
