Subtraction Strategies for 3-Digit Numbers

Miss KUSI from PS1 teaches how to subtract three-digit numbers using a base 10 sketch, a place value strategy. The lesson involves drawing base 10 blocks to represent numbers and borrowing when necessary. The example used is 452 - 285, where students learn to draw the base 10 map, borrow from higher place values, and verify their work by counting the blocks. The process is broken down into steps, ensuring students understand how to manage borrowing and subtraction across different place values.

What is the purpose of using a base 10 sketch in subtraction?

• To simplify addition problems

• To visualize the subtraction process

• To multiply numbers more efficiently

• To divide numbers without borrowing

How many columns are used in the base 10 map for the number 452?

• Two columns

• Three columns

• Four columns

• Five columns

What does the 'H' stand for in the base 10 map?

• Hexadecimal value

• Horizontal placement

• Height of the blocks

• Hundreds place

What place value is represented by 'T' in the base 10 map?

• Thousands

• Ones

• Tens

• Hundreds

What action is taken when there are not enough ones to subtract in the ones place?

• Ignore the ones

• Add more hundreds

• Reset the calculation

• Borrow from the tens place

How many tens are borrowed from the hundreds place when there are not enough tens?

• Twelve tens

• Ten tens

• Eight tens

• Five tens

How many ones are added to the ones place after borrowing from the tens?

• Five ones

• Ten ones

• Twelve ones

• Fifteen ones

After borrowing and subtracting, how many hundreds are left?

• Four hundreds

• Three hundreds

• Two hundreds

• One hundred

What is the final result of the subtraction 452 - 285?

• 177

• 157

• 187

• 167

What is the total left in the tens place after all subtractions?

• 80

• 60

• 40

• 20