Subtraction learning path

Subtract in Chunks: Take Away One Place at a Time

A large subtraction feels smaller when you split what you are taking away. Remove the hundreds first, then the tens, then the ones, keeping a running result.

Free lessonLearn at your own pace

The strategy

How it works

Split the number being subtracted into place-value chunks.
Subtract one chunk at a time from the running total.
Check the final result by adding the chunks back.

See it in action

Worked examples

Example 186 − 24

Take away 20: 86 − 20 = 66.
Take away 4: 66 − 4 = 62.
The difference is 62.

Answer: 62

Example 2154 − 32

154 − 30 = 124.
124 − 2 = 122.
Check: 122 + 32 = 154.

Answer: 122

A quick heads-up

Common mistakes to avoid

Subtracting the ones before the tens and losing track; choose an order and keep a running total.
Changing a digit instead of subtracting its place value, such as treating 20 as 2.

Your turn

Check your understanding

Choose an answer to see instant feedback and a short explanation. You can take the quiz again any time.

Question 1 of 3

What is 75 − 30?

Keep the momentum

Try a few practice problems

Choose a comfortable range and work through a short round with the free mental math trainer.

Practice subtraction