Decomposition Strategy in Addition and Subtraction

The video tutorial introduces strategies for addition and subtraction, focusing on the decomposition strategy and base 10 models. The decomposition strategy involves breaking down numbers into their digit values, performing operations column-wise, and combining results. Examples include adding 154 and 139, and subtracting 356 from 132. The base 10 model uses blocks to represent numbers, allowing for visual addition and subtraction. Examples include subtracting 216 from 424 and adding 172 to 243. The tutorial aims to enhance understanding of these mathematical operations.

What is the first step in the decomposition strategy for addition?

• Break apart each value into the value of each digit.

• Combine the values in the last row.

• Subtract each column starting from the ones.

• Use base 10 models.

When using the decomposition strategy, what is the result of adding 154 and 139?

• 239

• 329

• 293

• 2930

What is the final step in the decomposition strategy for addition?

• Combine the values in the last row.

• Break apart each value.

• Subtract each column.

• Use base 10 models.

In the decomposition strategy, what is the result of adding the hundreds column for 154 and 139?

• 200

• 100

• 300

• 150

What is the result of adding the tens column for 154 and 139 in the decomposition strategy?

• 80

• 70

• 90

• 60

In the decomposition strategy, what is the result of subtracting 132 from 356?

• 242

• 234

• 224

• 214

What is the result of subtracting the tens column for 356 and 132 in the decomposition strategy?

• 30

• 10

• 40

• 20

What is the first step in the decomposition strategy for subtraction?

• Combine the values in the last row.

• Break apart each value into the value of each digit.

• Add each column starting from the ones.

• Use base 10 models.

What is the result of subtracting the ones column for 356 and 132 in the decomposition strategy?

• 4

• 6

• 2

• 8

What is the first step when using base 10 models for subtraction?

• Add the second value to the first.

• Regroup the blocks.

• Subtract the first value from the second.

• Model the first value with base 10 blocks.