Count back by 10s from 90 to 40

Step by step

The question

Question: count back by 10s from 90 to 40.

1 Start at 90

Here is a number line.

2 Jump by 10s

Each jump is 10 less.

We say the number where we land.

3 Write the numbers

Now we write them in a row.

We stop at 40.

4 Check

Look at the ones digits.

They stay 0.

Only the tens change.

Yes!

It works.

Let's look back.

First: start at 90.

Then: jump by 10s.

Then: write the numbers.

Last: check.