Counting in Tens Class 2 Notes Maths

How Many Are These?

Once upon a time, there was a young girl named Lila who lived on a farm with her parents. One day, while playing outside, she saw a basket full of chickens. She started to play with them.

After playing, she decided to count them, so that when she comes back in the evening, all should be there.

Now, can you tell me how many baskets of 10 chickens are there?

There are 2 baskets of 10 chickens each.

Lila returns in the evening and sees more chicken around the basket.

Can you now count and tell the total number of chickens present?

There are 2 baskets of 10 chickens each and 5 chickens are outside. 

So in total there are 20 + 5 = 25 chickens.

What is Ones and Tens Concept? 

Let us quickly revise the ones and tens concept with the help of an example.

• Let’s take 10 pencils.

• Now make a group of 10 pencils.
• We can make only 1 group. It represents 1 Ten. But there is no single pencil remaining. It indicates 0 ones.
• So, the number 10 can write as:

Now, can you count the number of groups or bundle of pencils given below?

• We can represent 100 as 10 groups of Tens
• We use the hundreds place. 
• The number 100 is written as:

Do You Know How to Count in Tens?

Example 1:

• Count the number of birds given below

There are 10 birds.

• Now, if 2 birds fly away, then how many birds will be there?

There were 10 birds

2 birds flew away

So, the birds left will be 10 birds - 2 birds

= 8 birds

• Now, if 10 birds join the remaining 8 birds, what will be the total number of birds?

The total number of birds will be 10 + 8

= 18 birds

Example 2:

• Count the number of balloons in 1 bundle

There are 10 balloons

• If there are 10 balloons in 1 bundle, then how many balloons are there in 4 bundles?

1 bundle = 10 balloons

4 bundles = 10 + 10 + 10 + 10

So, 4 bundles = 40 balloons

• Can you calculate the total number of balloons given below?

3 bundles = 30 balloons

1 bundle = 6 balloons

Total balloons = 30 + 6

= 36 balloons