Column Subtraction with Exchanging Quiz

What is the first step in column subtraction without exchanging?

• Line up the numbers in the correct columns

• Start from the thousands column

• Exchange tens for ones

• Subtract the largest digit first

In the example 1,242 - 1,125, why do we need to exchange?

• Because 4 is greater than 1

• Because 1 is greater than 2

• Because 2 is greater than 5

• Because 5 is greater than 2

After exchanging in the example 1,242 - 1,125, how many ones do we have?

• 2 ones

• 5 ones

• 10 ones

• 12 ones

In the example 4,345 - 2,193, what do we exchange to solve the tens column?

• 10 tens for 100

• 100 for 10 tens

• 10 for 10 ones

• 1,000 for 10 hundreds

What is the result of 4,345 - 2,193?

• 2,152

• 2,153

• 2,150

• 2,151

In the practice problem 7,548 - 5,828, what is the result of the ones column?

• 0

• 3

• 1

• 2

Why do we need to exchange in the hundreds column for the problem 7,548 - 5,828?

• Because 8 is greater than 5

• Because 5 is greater than 8

• Because 2 is greater than 1

• Because 7 is greater than 6

What is the final answer for the problem 7,548 - 5,828?

• 1,721

• 1,722

• 1,723

• 1,720

What should you do if the bottom digit is larger than the top digit in column subtraction?

• Add to the top digit

• Subtract as usual

• Ignore it

• Exchange from the next column

What is the key phrase to remember when deciding to exchange?

• Subtract the largest number first

• If there's more on the floor, pop next door

• Always start from the left

• Exchange only when necessary