Teacher talks: Video playlist

[THEME MUSIC]

[SCHOOL BELL RING]

Hello, I’m Mr. Smith and together we’re going to learn about counting in hundreds.

Counting up and down in hundreds is really important. Our number system revolves around hundreds. We use the word century to describe a period of time in the past. For example, did you know that Henry VIII was born in the 15th century? That helps us to pinpoint which hundred-year period that was.

Our money system uses hundreds too. There are 100 pennies in a pound. When you count up and down in hundreds it’s just like when you count in tens and ones. Only this time you’re changing the hundreds digits. The tens and ones stay the same.

Let’s take a look at a number line. Can you see how the hundreds column changes while the tens and ones stay the same?

Once you reach 1000, an extra digit is included in the thousands column. But then remains the same as the hundreds continue to change. Let’s take a closer look.

Place value is really important when counting in hundreds. You need to make sure that you are only changing the hundreds column. Look at this place value chart. There are four hundreds, five tens and two ones. That makes 452.

What number would we reach if we added on three more hundreds? See how the hundreds column changes but the rest stays the same? Now, altogether we have 752. We could write this as 452 add 300. Which equals 752.

Counting forwards and backwards in steps of 100 is the same as adding and subtracting. So, let’s see what happens when we count backwards in hundreds.

If we start with 672, let’s count back 300. This would be the same as 672 subtract 300. Let’s count it together on the number line. So, starting with 672, we go to 572, 472, 372. Now we’ve counted back 300s on the number line we reached 372.

How easy is counting in hundreds when you know that only the place value of the hundreds changes. Can you help me decide whether I’ve answered these questions correctly? If you think I’ve got it right, put your thumbs up. If you think I’m wrong, put your thumbs down. If you need more time, don’t forget you can pause the video. Let’s go!

If I started at 200 and counted forward five steps of 100, I would reach 700. Am I right or wrong? You can use the number line to help you if you need it. Yes, thumbs-up… I am right. Five steps of 100 from 200 is 700. As an addition, it would be 200 add 500 equals 700.

Let’s try another one, but this time we’re going to try counting backwards. Remember, only the hundreds column should change. I’ve written a sequence going down in hundreds. Is my work correct? Oh, whoops nom I’ve made a mistake. I’ve reduced the hundreds and tens column when counting back from 889, from 999. The correct sequence should be 999, 899, 799, 699, 599.

When counting in hundreds, just remember that the only place value that changes is the hundreds column. The tens and ones stay the same.

Why not practise counting forwards and backwards in hundreds while doing exercises such as star jumps or skipping?

For more help, challenges and games on this subject visit bbc.co.uk/bitesize.