Subtraction Concepts and Strategies

This video tutorial for second grade module 5 lesson 13 focuses on teaching the standard subtraction algorithm using manipulatives. The lesson begins with an introduction to the objectives and the use of place value discs. It then demonstrates solving subtraction problems using both place value discs and the standard algorithm. The video also covers checking work with addition to ensure accuracy. A second example problem is solved, and the lesson concludes with a tricky problem that requires students to deduce the original subtraction problem.

Why are manipulatives used in this lesson?

• To make the lesson more colorful

• To help students understand the standard subtraction algorithm

• To keep students entertained

• To teach addition

What should students do if they don't have enough ones to subtract?

• Skip the problem

• Start over

• Add more ones

• Unbundle a ten into ones

How many ones are left after subtracting 8 from 13?

• 3

• 8

• 5

• 7

What is the result of 153 minus 38?

• 125

• 145

• 115

• 135

What is the purpose of checking the subtraction result using addition?

• To practice addition

• To verify the subtraction result

• To confuse students

• To make the lesson longer

What is the first step in solving 485 minus 177 using place value discs?

• Subtract the ones

• Model 485 with discs

• Subtract the tens

• Subtract the hundreds

How many tens are left after unbundling one ten in the problem 485 minus 177?

• 5

• 8

• 6

• 7

What is the result of 485 minus 177?

• 308

• 318

• 328

• 338

How many ones are left after subtracting 9 from 14 in the problem 534 minus 319?

• 3

• 4

• 5

• 6

What is the final answer for the problem 534 minus 319?

• 205

• 215

• 225

• 235