Video: Modelling and Counting 8 and 9

In this video, we will learn how to represent one object by another to help us count 8 or 9 objects.

08:12

Video Transcript

Modelling and Counting Eight and Nine

In this video, we will learn how to represent one object by another to help us count eight or nine objects. Let’s model eight using the 10 frame and our counters. One, two, three, four, five, six, seven, eight. Eight is two less than 10. We had 10 counters and we have two leftover. This is one way to show the number eight. We could show eight by placing all of our counters in a straight line. We could also show number eight using two rows of four or four rows of two. Two, four, six, eight. There are still eight counters.

We could also represent number eight like this, like this, or like this. We can represent the number eight in lots of ways. The same is true of the number nine. Nine is one less than 10. If we have 10 counters and we place nine in a ten frame, we will have one counter left. We can represent the number nine in lots of ways. It doesn’t matter how we place the counter or which pattern we make. There are still nine counters.

Sometimes when we’re asked to count a number of objects, they could be placed randomly. That means there’s no pattern that we can see. It’s hard to count objects when they’re placed randomly. But if we place all our counters in a ten frame, it helps us to count them more easily. One, two, three, four, five, six, seven, eight, nine. Let’s practise modelling and counting eight and nine objects.

Count the giraffes. Show the same number using trees.

We’re shown a picture of some giraffes, and the first thing the question tells us is to count them. Let’s use counters to represent each of the giraffes to make sure we count them accurately. One, two, three, four, five, six, seven, eight, nine. The second part of the question tells us that we have to show the same number of trees. If there are nine giraffes, then we need nine trees. One, two, three, four, five, six, seven, eight, nine. We counted the giraffes. We used counters to help. There are nine giraffes and nine trees. To show the same number of trees as giraffes, we needed nine trees.

Count the elephants. Show the same number using balls.

We’re shown a number of elephants. And the first part of the question tells us to count them. Let’s use counters to help make sure we count them all correctly. One, two, three, four, five, six, seven, eight. There are eight elephants. We have to show the same number using the balls. Which of our three groups of balls shows the number eight? Let’s look at the first picture. Does this show eight balls?

Let’s check using our counters. One, two, three, four, five, six, seven, eight. This picture shows the correct number of balls. There are eight elephants and eight balls. This picture only has six balls. We would need two more to show eight. Six is two less than eight. And this picture has nine balls. It has one more ball than eight. We would need to take one ball away to show eight. We counted eight elephants and we showed the same number using balls.

Place a counter in the ten frame for each of the rabbits.

We’re shown a number of rabbits. We have to count them by placing a counter in the ten frame for each of the rabbits. Each time we count a rabbit, we have to place a counter in the ten frame. One, two, three, four, five, six, seven, eight, nine. There are nine rabbits and nine counters in the ten frame. Nine is one less than 10. That’s why there’s one space left in the ten frame. Which of these ten frames shows the number nine.

The first ten frame is full, which means it has 10 counters. But the second frame has one less, which means it has nine. This is the ten frame that shows the number of rabbits. There are nine rabbits and nine counters. The third ten frame has two less than 10, which means there are eight counters. The ten frame, which shows the correct number, is the one which shows nine counters.

What have we learned in this video? We’ve learned how to use models to help us count eight or nine objects accurately. We’ve also learned that we could use objects such as counters to help us count eight or nine objects.

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