Column subtraction
Subtract whole numbers, exchanging when needed.
- Line up equal place values and start on the right.
- Exchange one unit from the next available column when the top digit is too small.
- Cross out changed digits and show the new values above them.
Example 1
Calculate using a written method.
Exchange before subtracting.
Example 2
Calculate using a written method.
Exchange before subtracting.
Remember
Use the diagrams to track each step, then check your answer.
Your turn
Calculate using a written method.
Check answer
Exchange before subtracting.
Calculate using a written method.
Check answer
Exchange before subtracting.
Calculate using a written method.
Check answer
Exchange before subtracting.
Calculate using a written method.
Check answer
Exchange before subtracting.
Calculate using a written method.
Check answer
Exchange before subtracting.
Calculate using a written method.
Exchange before subtracting.
Calculate using a written method.
Exchange before subtracting.
Calculate using a written method.
Exchange before subtracting.
Calculate using a written method.
Exchange before subtracting.
Calculate using a written method.
Exchange before subtracting.