Use level 3 to practice subtracting decade number from decade number. 

This is for a student if Mrs. Harlan has introduced the activity to you. 

Work on your math fact fluency here. Log in with your first name and your 4 digit pin. Each student was assigned a number 1-21 and there are 1 or 2 0's before it.

Decompose numbers up to ten

Decomposing to make a ten when adding

Adding using doubles facts.

Adding doubles facts car race

build it

Addition with Near Doubles