Subtracting 10 or 100 Mentally Using Base 10 Blocks

This lesson teaches how to mentally subtract 10 or 100 from a three-digit number using base 10 blocks. It explains the concept of place value and how each digit in a number represents different values. The lesson includes visualizing numbers with base 10 blocks and demonstrates subtraction by removing blocks from the hundreds or tens place, showing that the other places remain unchanged. By the end, students will understand how to perform these subtractions mentally by visualizing the changes in the base 10 blocks.

What is the value of the digit in the hundreds place in the number 253?

• 3

• 0

• 5

• 2

When subtracting 10 from 365 using base 10 blocks, which digit changes?

• Tens

• Hundreds

• Ones

• None

After subtracting 10 from 365, what is the resulting number?

• 375

• 355

• 365

• 345

In the example of subtracting 100 from 762, which place value is affected?

• Hundreds

• Tens

• Ones

• All of them

What is the result of subtracting 100 from 762 using base 10 blocks?

• 762

• 672

• 752

• 662