# 2.02 Count by 10's, 100's

Lesson

## Ideas

Do you remember the  names for each place in a number  , up to the thousands?

Idea summary

## Count by 10's

Let's see how we can count by 10's, using a 100 grid.

### Examples

#### Example 1

Complete the pattern by adding 10 each time.

20,⬚,40, ⬚, ⬚

Worked Solution
Create a strategy

Use the place value table to add 10 to each number.

Apply the idea

Put 20 in the place value table and add 10.

The amount in the tens place goes up by one and we get a result of\,30. The ones value does not change. We add ten again to complete the pattern by adding 1 to the tens place each time.

The complete pattern is 20,\,30,\,40,\,50,\,60.

## Count by 100's

Now it's time to count by 100's.

### Examples

#### Example 2

Complete the pattern by adding 100 each time.

9,109,⬚,⬚, ⬚, 509

Worked Solution
Create a strategy

Use the place value table to add 100 to each number.

Apply the idea

Put 109 in the place value table and add 100.

The amount in the hundreds place goes up by one and we get a result of\,209. The ones and tens values do not change. We add 100 again to complete the pattern by adding 1 to the hundreds place each time.

The complete pattern is 9,\,109,\,209,\,309,\,409,\,509.

Idea summary

### Outcomes

#### MA2-4NA

applies place value to order, read and represent numbers of up to five digits