Compensation and Vertical Strategies in Subtraction

Mrs. Walker introduces subtraction strategies focusing on numbers with zeros. The lesson covers the compensation strategy and the arrow way, providing examples and practice problems. Students learn to subtract from multiples of 100 and numbers with zero in the tens place using these strategies. The video encourages students to choose the strategy they are most comfortable with and provides guidance on solving subtraction problems efficiently.

What is the main focus of today's lesson?

• Division strategies

• Multiplication strategies

• Subtraction strategies with zeros

• Addition strategies

What materials are needed for the lesson?

• Calculator

• Notebook

• Dry erase board

• Textbook

Why can't we use the vertical form directly for 300 minus 159?

• It requires decomposing and unbundling

• It requires multiplication

• It is too simple

• It involves division

What is the first step in the compensation strategy for 300 minus 159?

• Add 1 to both numbers

• Divide both numbers by 2

• Subtract 1 from both numbers

• Multiply both numbers by 2

What is the result of 300 minus 159 using the compensation strategy?

• 150

• 170

• 141

• 160

What is the result of 300 minus 159 using the vertical form?

• 171

• 141

• 151

• 161

What is the first step in solving 500 minus 257 using the compensation strategy?

• Add 2 to both numbers

• Multiply both numbers by 3

• Divide both numbers by 3

• Subtract 1 from both numbers

What is the result of 500 minus 257 using the compensation strategy?

• 273

• 263

• 253

• 243

What is the result of 500 minus 257 using the vertical form?

• 273

• 263

• 253

• 243

What is the main idea of the adding to solve strategy?

• Dividing to find the quotient

• Adding to reach a target number

• Subtracting to find the difference

• Multiplying to find the product