NCERT Solutions for Class 2 Maths Chapter 4

1. In the morning, she counted her chickens. 

1. How many baskets of 10 chickens are there? ____________ 

2. How many chickens are there in all? $50 + 4 = $____________

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Ans: 

1. There are 5 baskets, each having 10 chickens. 

2. There are a total of 50 chickens in 5 baskets and four outside. $50 + 4 = 54$.

Thus, there are 54 chickens.

2. In the evening, she counted the chickens again. 

1. There are ___________ baskets of 10 chickens.

2. There are __________ $ + 3$ = __________ chickens in all.

3. $54{\mkern 1mu}  - $ ___________ = ___________ chickens have been eaten by the fox.

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Ans: 

a) There are 4 baskets of 10 chickens. 

b) There are $40 + 3 = 43$ chickens in all. 

c) $54 - 43 = 11$ chickens have been eaten by the fox.

How many are These 

3. He uses 10 sticks to make 1 bundle. 

1. 3 bundles have __________ sticks.

2. Now, how many sticks in all are these? ____________ sticks in all.

3. 4 bundles would have _____________ sticks.

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Ans: 

1. 3 bundles have 30 sticks.

2. 39 sticks in all. 

3. 4 bundles would have 40 sticks. 

There is a wedding in Malti’s house. She is making flower garlands. 

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4. So there are _______ flowers in all. 

Ans: 58

5. How many flowers are these?

Ans: 67 flowers in all. 

6. How many garlands of 10 flowers each can you make using 21 flowers? Draw them in the space below. 

Ans: If each garland is of 10 flowers, then we can make 2 garlands out of 21 flowers and 1 will be remaining.

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7. Let us help Leela. 

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1. How many packets of 10 pencils are there? ____________ 

2. How many pencils are outside the packets? ____________ 

3. So, altogether, there are ___________ pencils. 

Ans: 

1. There are 6 packets of pencils.

2. There are 4 pencils outside the packets. 

3. So, altogether, 

\[ \Rightarrow (6 \times 10) + 4 = 64\]

There are 64 pencils.

8. Kanak likes collecting different kinds of bindis.

1. How many packets does she have? ___________

2. So how many bindis in all? ___________ 

(Each packet has $3 + 4 + 3$ bindis.)

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Ans: 

1. She has 7 packets of bindis. 

2. Since each packet has 10 bindis, then there are 70 bindis in all.

NCERT Solutions for Class 2 Maths Chapter 4 Counting in Tens

What is Counting by Tens With Numbers?

Counting by Tens with numbers means 10, 20, 30, 40, 50, 60, 70, 80, 90 and so on. So what are we doing here? We are jumping each number by 10 numbers. This is called counting in tens.

You will notice that when we are counting the numbers by 10, we are actually creating a pattern. Have you seen all the numbers are ending in a zero? The first digits are the same as numbers when you count (1, 2, 3, 4, 5, etc.) and the last digit is the same for all the numbers i.e. 0.

Let Us Understand Better With Examples.

We take a bunch of grapes that have 10 grapes in it. Now we add another bunch of 10 grapes to the first bunch. 

What is the total number of grapes now? 10 + 10 = 20 grapes. We add another bunch of 10 grapes to 20 grapes. How many grapes are there in total? 

          20 + 10 = 30 grapes

In the above example, we are adding 10 grapes each time and jumping to the next tenth number.

Another example: We have 4 bundles of pencils. Out of those 4 bundles, 3 bundles have 10 pencils each and the fourth bundle has 5 pencils. 

So how many pencils are there? Let us count by bundles.

10 +        10 +   10  +   5     =      35 pencils

        1st bundle           2nd bundle        3rd bundle          4th bundle

Grouping

Let us understand grouping now. 

Example: We have 24 stars. Let us group the stars in tens. How many groups can we make out of 24 stars?

1st group + 2nd group

    10   10

We are left with 4 stars. We can make only two groups of stars in tens.

We have 4 stars left. How many stars do we need to make it a group of ten? We need 6 more stars to make it 10. We are adding 6 + 4 = 10. 

Conclusion

The purpose of teaching counting in tens to the students ofClass 2 is because they can use this concept next year when they will start to learn addition. These are the basics of Maths that children must know at this budding stage. You can practice more examples on your own to understand the concept better.