Grade 4 - Numbers, Operations and Relationships
Standard 4.NOR.1.1.4 - Practice estimating subtraction word problems by first rounding the numbers then finding the difference.
Included Skills: Estimation
Calculation techniques • Use a range of techniques to perform and check written and mental calculations of whole numbers including - estimation - building up and breaking down numbers - rounding off and compensating - doubling and halving - using a number line - using addition and subtraction as inverse operations - using multiplication and division as inverse operations