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Want to learn more about Problem Strings? Check out the links below.

 

 Addition


 

Get to a Friendly Number
Over
Over
Get to a Friendly Number
Swapping
Swapping
Building Number

 

Subtraction


 

Removal vs. Difference
Constant Difference
Over
Over
Removal vs. Difference

 

Multiplication


 

Over
Over
Using Quarters
Multiply to Divide
Over and Adjust
Click to Watch Live
Five is Half of Ten

 

Division


 

Over and Under
Remainders
9's Divisibility Relationships
Smart Partial Quotients
Partial Quotient

 

Ratio and Proportion, Fractions


 

Fractions as Operators
Inverse Variation
Over

 

Geometry 


 

Quadrilaterals

Want more of these? 

Check out my books Building Powerful Numeracy and Lessons and Activities for Building Powerful Numeracy