How Subtraction Works
What is subtraction? Play with objects and find out!
Yardstick Subtraction
Learn how to do subtraction in your head using a yardstick or number lineFact Families
Learning your number families for addition and subtractionSubtracting Numbers Within 1000
Learning how to regroup when subtracting three-digit numbersPlace Value Review
A review of place values to get you ready for subtraction with bigger numbersSubtracting Numbers Within 100 With Regrouping
Learning how to regroup when subtracting two-digit numbersSubtracting Numbers Within 100
Getting used to subtracting bigger numbers