An engaging subtraction algorithm teaching presentation.
Use this animated PowerPoint with your students when learning how to use the subtraction algorithm and borrowing.
Subtraction with Borrowing
Teaching vertical subtraction with borrowing/regrouping can be a challenge. This teaching presentation aims to simplify the process by using a conversational tone. You can narrate each step by reading the text and the on-screen visuals will match.
The presentation begins with an explanation of borrowing using concrete materials, i.e. base-10 blocks, to help visualize quite an abstract concept. Extend this portion of the presentation by having students replicate this using physical blocks and then using numbers of their own choosing.
Nothing to Borrow?
The teaching presentation also has a section describing what to do when a neighboring column has nothing to borrow. You could complete this section at the same time as the first or separate these parts over two lessons to ensure your students grasp the concept of traditional borrowing before moving on to ‘double borrowing’.
This presentation uses the animation features of PowerPoint. This may result in some slides appearing to have elements that overlap when viewed in edit mode. View the presentation in ‘Slide Show’ mode for best results and to see the awesome animations.
Common Core Curriculum alignment
Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in addin...
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including roundi...
Fluently add and subtract multi-digit whole numbers using the standard algorithm.
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