Bài 12: Ascending, descending order : yêu cầu tăng dần, giảm dần

                    

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Starry, here we are at the park.

So many things to play on swing, merry-go-rounds.

I’m sure you like.

This slide is the best.

It has colorful steps with numbers on it.

Have you ever been on a slide Starry?

Look, you have to ascend the steps from here.

Ascend means to go up Starry!

So, to go up the stair, we go 1-2-3-4-5, here we are at the top.

Now, Starry, if you do get scared and you don’t want to use the slide.

You can come down the steps again.

You can descend. But, be careful.

You need to come down on descend 1 step at the time. 
Like this. 5-4-3-2-1 and you are on the ground again.

Starry, when we go from the smallest number to the biggest number.

We see the numbers are arranged in the ascending order.

Here, 1 the smallest number and 5 the biggest number.

So 1-2-3-4-5. Ascending order up the slide.

And when we go from the biggest number to the smallest number, we see the numbers are arranged in descending order.

5 is the biggest number and 1 is the smallest.

So 5-4-3-2-1 descending order down the slide.

Starry, when you have to arrange number in the ascending or descending order.

You first find the smallest and the biggest number.

You then arrange the number in the middle to in the similar panel.

Take the number 1-2-3-4.

Now, 1 is smallest number and 4 the biggest.

We have 1 (dash)  (dash)  4.

Similarly between 2 and 3, 2 is the smaller number.

So, we write 2 in the first blank, then 3.

So 1-2-3-4 that is arrangement in ascending order.

For descending order,  we take the biggest number first and then the smallest.

So 4 -(dash) -(dash) - 1.

Between 3 and 2, 3 is the bigger number.

We get 4-3-2-1 the arrangement in descending order.

Now, let us do an activity together.

Here are set of four numbers.

We have to first circles the smallest number, then the biggest number and then put the numbers in ascending order.

Shall we begin! 

7-8-5-3.
The smallest number is 3.

The biggest number is 8.

Between 7 and 5, 5 is the smaller number.

The numbers in ascending order are 3-5-7-8.

1-9-7-4.
Here, Starry.
The smallest number is 1.

The biggest number is 9.

Between 7 and 4, 4 is the smaller number.

The numbers in ascending order are 1-4-7-9.

2-9-6-5. 
What do you think it is the smallest number Starry?

Yes, the smallest number is 2 and the biggest number is 9.

So, between 6 and 5, 5 is the smaller number.

The numbers in ascending order are 2-5-6-9.

8-3-4-1.
Here, the smallest number is 1 and the biggest number is 8.

Between 3 and 4, 3 is the smaller number.

The numbers in ascending order are 1-3-4-8.

7-5-1-6.
In this set Starry, the smallest number is 1.

The biggest number is 7.

And between 5 and 6, 5 is the smaller number.

The numbers in ascending order are 1-5-6-7.

And in this activity Starry, we have to first circle the biggest number then the smallest and then put the numbers in descending order.

Let’s begin.   

7-9-5-4. 
Starry, the biggest number here is 9 and the smallest number is 4.

Between 7 and 5, 7 is the bigger number.

The numbers arrange in descending order are 9-7-5-4.

2-3-5-9.
The biggest number is 9.
The smallest number is 2.

Between 3 and 5, 5 is the bigger number.

The numbers arrange in descending order are 9-5-3-2.

The next set of numbers is 5-7-1-8.

The biggest number is 8. The smallest number is 1

Between 5 and 7, 7 is the bigger number.

Starry, the numbers arrange in descending order are 8-7-5-1.

Starry, what about 6-8-3-2 ?

Yes, the biggest number is 8.

And the smallest number is 2.

Between 6 and 3, 6 is the bigger number.

The numbers arrange in descending order are 8-6-3-2.

Finally, the numbers 1-6-7-2.

The biggest number is 7, the smallest number is 1.

Between 6 and 2, 6 is the bigger number.

The numbers arrange in descending order are 7-6-2-1.

Remember, Starry .
Ascending order means you arrange number from the smallest to the biggest number.
Descending order means from the biggest  to the smallest number.

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