Unformatted text preview: left? Comparison Interpretation We compare two different sets or measurements; subtraction is interpreted as the differences. Set ModelLilly has 11 dolls. Megan has 8. How many more dolls does Lilly have? Measurement ModelSam weighs 56 pounds. Beth weighs 48 pounds. How much heavier is Sam? Place valuethinking strategies: Counting down Simple subtractions done by counting down. Counting up Compete differences by counting up. Compensation We adjust the problem by adding or subtracting the same amount to both minuend and the subtrahend therefore leaving the difference unchanged....
View
Full Document
 Spring '10
 Kwon
 Math, Addition, Subtraction, Elementary arithmetic, Subtraction Subtraction, Set ModelThe class

Click to edit the document details