Order 999, 1,001, 990

Step by step

The question

Question: put 999, 1,001, 990 in order, from least to greatest.

1 Line up the places

We line up the ones under the ones, the tens under the tens, and so on.

2 Compare from the left

1,001 has more digits than 999.

More digits means bigger.

So 1,001 is greater than 999.

999 and 990 are the same in the first 2 places.

Look at the ones: 9 is more than 0.

So 999 is greater than 990.

3 Write them in order

From least to greatest: 990 < 999 < 1,001.

Careful!

999 has big digits, but fewer of them.

A number with more digits is bigger.

4 Check

On a number line, smaller numbers are to the left.

Left to right: 990, 999, 1,001.

The same order.

Yes!

It works.

Let's look back.

First: line up the places.

Then: compare from the left.

Then: write them in order.

Last: check.