Solve 81 = 7 tens □ ones

Step by step

The question

Question: 81 is 7 tens and how many ones?

1 Show it with blocks

A ten is 10 ones stuck together.

81 is 8 tens and 1 one.

2 Break a ten

3 Count the ones

Now there are 1 ones and 10 more ones.

That is 11 ones.

4 Write the number

So 81 is 7 tens and 11 ones.

Careful!

7 tens and 1 one is only 71.

We must count the 10 new ones.

5 Check

7 tens is 70.

70 and 11 make 81.

Yes!

It works.

Let's look back.

First: show it with blocks.

Then: break a ten.

Then: count the ones.

Then: write the number.

Last: check.