Subtraction Using Base Ten Blocks

What is the first step in subtracting 17 from 43 using base ten blocks?

• Add 17 to 43.

• Exchange a ten block for ten one blocks.

• Write down the numbers 43 and 17.

• Subtract the tens first.

Why do we need to exchange a ten block for ten one blocks?

• To have enough ones to subtract seven.

• Because we have more ones than tens.

• To increase the total number of blocks.

• To make the subtraction easier.

After exchanging a ten block, how many ones do we have?

• Three ones

• Ten ones

• Seven ones

• Thirteen ones

How many one blocks are left after subtracting seven ones?

• Six ones

• Seven ones

• Eight ones

• Five ones

What is the final result of subtracting 17 from 43?

• 26

• 20

• 30

• 24