Subtraction Models for 3-Digit Numbers with Regrouping
Practice drawing models to subtract 3-digit numbers with regrouping across zeros using a PowerPoint lesson that focuses on visual strategies for subtraction. This resource provides a different approach to subtraction for students struggling with traditional methods, emphasizing understanding of place value. Explore subtraction through models, number lines, and compensation strategies for effective learning and teaching.
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Presentation Transcript
Lesson Opening Draw a model to solve 729 425 = ? 304 400 20 5 304 309 329 729
Lesson Opening Lesson Opening Draw a model to find the difference between 581 and 218. 357 363 377 799
Unit 7, Lesson 10 This Powerpoint is meant to provide practice drawing models to subtract 3-digit numbers with regrouping across zeros. Your textbook focusses on the standard algorithm, which is not assessed in grade 2. For some of your students, this provides a strategy to attempt operations that they find troubling otherwise. Please preview this Powerpoint lesson in SlideShow mode so that you can see what/how the animations work. It is important that you understand the intent of this resource before placing it before your students. Which questions you assign will depend on your time and student understanding. This Powerpoint serves as a menu. As with all lessons, GO Math! is not your curriculum ..your standards are! Feel free to teach this concept using any resources that align with your standards and include rigorous practice. There are many resources that have been vetted and organized on the Unit 7 Blender page.
Teacher Modeling (I Do) Draw a model for the equation 500 500 367 = ? 367 = ? 133 Let s draw a number line! 300 60 7 133 140 200 500
Teacher Modeling (I Do) Draw a different model for the equation 500 500 367 = ? 367 = ? If we take away 1 from the minuend and subtrahend, the difference will be the same. 499 499 366 = ? 366 = ? Hundreds Hundreds Tens Tens Ones Ones 4 hundreds 3 hundreds 9 tens 6 tens 9 ones 6 ones 1 hundred + 3 tens + 3 ones 133 133
Guided Practice (We Do) Draw a place value model to find the difference between 611 611 and 800 800. Let s use the Compensation strategy to solve 799 799 610 = ? 610 = ? Hundreds Hundreds Tens Tens Ones Ones 7 hundreds 6 hundreds 9 tens 1 tens 9 ones 0 ones 1 hundred + 8 tens + 9 ones 189 189
Guided Practice (We Do) Use a number line to find the difference between 611 and 800. 100 80 9 611 711 791 800 189
Independent Practice (You Do Together) Use the Compensation strategy to take 199 from 401. To do this, we can subtract 2 from the minuend and subtrahend. 399 399 197 = ? 197 = ? Hundreds Hundreds Tens Tens Ones Ones 3 hundreds 1 hundred 9 tens 9 tens 9 ones 7 ones 2 hundreds + 0 tens + 2 ones 202 202
Independent Practice (You Do Together) Use a number line to subtract 199 from 401. 200 2 199 399 401 202
Independent Practice (You Do Alone) Draw a model to solve. 1. Terry had $500. He spent $398 for art lessons. How much money does Terry have left? 2. There were 300 students in second grade. 165 went on a field trip. How many students were still at school? 3. Chip had 242 meters of rope. He needed 600 meters to make an art project. How many meters of rope does Chip need?
