Constant Difference

Today we began looking at a new strategy to help with mental subtraction called Constant Difference. This involves taking our 2 numbers that we are subtracting, and changing them in order to help solve a subtraction problem easier mentally.

In class today, we completed this anchor chart and glued it into our math notebooks.

In order to subtract easier without having to regroup all of the 0's, we subtracted 1 from out minuend and our subtrahend. This kept the amount between each number the same. We then subtracted as we normally would and checked our answer with the inverse operation.

This anchor chart can be found in your child's math notebook. A video of this strategy can be found on your child's Pearson Math page. Pearson can be accessed by logging into Ready Hub. From there, click the Math Textbook link. Once inside the Math Textbook, click Unit 2, Topic 3. This will take you to a list of videos for 2-3. Both the Visual Learning Video and the Another Look Video are helpful in explaining this strategy.

If you have any questions, please let me know! 😊