Modeling Subtraction with Base Ten Blocks

The video tutorial explains how to model subtraction of two-digit whole numbers using base ten blocks. It begins with the problem 64 minus 28, demonstrating the need for exchanging a ten-block to subtract the ones place. The process is shown both with blocks and on paper. A second example, 52 minus 14, is provided to reinforce the method. The tutorial concludes with a summary of the subtraction technique.

What is the initial step in modeling subtraction using base ten blocks?

• Exchange all blocks for ones

• Count the total number of blocks

• Add the numbers together

• Identify the number of tens and ones

Why is an exchange necessary when subtracting 28 from 64?

• Because the tens need to be doubled

• Because there are not enough ones to subtract

• Because subtraction always requires an exchange

• Because 64 is larger than 28

After exchanging a ten-block for ones, how many one-blocks are available in the example of 64 minus 28?

• 12 one-blocks

• 10 one-blocks

• 16 one-blocks

• 14 one-blocks

What is the result of subtracting the ones in the example of 64 minus 28?

• 6

• 8

• 10

• 4

In the tens place, what is the result of subtracting 28 from 64?

• 4

• 5

• 3

• 2

In the second example, what is the first step when subtracting 14 from 52?

• Subtract the ones directly

• Add more one-blocks

• Exchange a ten-block for ones

• Subtract the tens directly

How many one-blocks are available after the exchange in the example of 52 minus 14?

• 13 one-blocks

• 11 one-blocks

• 10 one-blocks

• 12 one-blocks

What is the result of subtracting the ones in the example of 52 minus 14?

• 8

• 7

• 9

• 6

In the tens place, what is the result of subtracting 14 from 52?

• 3

• 5

• 4

• 2

What is the final difference when subtracting 14 from 52?

• 40

• 38

• 36

• 42