Students can use Joyful Mathematics Class 2 Solutions Chapter 3 Fun with Numbers (Numbers 1 to 100) to explore alternative methods of solving problems.

## Joyful Mathematics Class 2 NCERT Solutions Chapter 3 Fun with Numbers (Numbers 1 to 100)

Look at the Ginladi (Page 23) :

A. How many beads are there in ginladi?

Answer:

100

B. There are some blank cards on the ginladi.

Write the numbers on them by counting the number of beads.

Answer:

C. Make number cards for the following numbers and place them on your ginladi.

38, 44, 58, 65, 98

Answer:

Look at the number strip and fill in the blanks.

A. The butterfly moves ______________ steps forward to reach the pink flower.

Answer:

6

B. The honey bee moves ______________ steps forward to reach the red flower and ______________ steps forward to reach the yellow flower.

Answer:

The honey bee moves 5 steps forward to reach the red flower and 10 steps forward to reach the yellow flower.

C. The squirrel jumps 2 steps backward, five steps forward and again 3 steps backward. It will reach at ______________.

Answer:

The squirrel jumps 2 steps backward, five steps forward and again 3 steps backward. It will reach at 95.

D. The frog jumps 2 steps forward, seven steps backward and again 3 steps backward to reach ______________.

Answer:

The frog jumps 2 steps forward, seven steps backward and again 3 steps backward to reach 60.

Let us Play (Page 24) :

Guess my Place

Three ants are sitting on a number line. Write the numbers for these ants.

Black ant is sitting on the number

Answer:

30

Red ant is sitting on the number

Answer:

50

Brown ant is sitting on the number?

Answer:

60

Draw an ant on number 65 on the number line shown above.

Draw a sugar cube 0 on number 79 on the number line shown above.

Answer:

Complete the following patterns.

A.

1, 4, 7, _____, _____, _____, _____

Answer:

1, 4, 7, 10, 13, 16,19

B.

40, 45, 50, _____, _____, _____, _____

Answer:

40, 45, 50, 55, 60, 65, 70, 75

C.

50, 60, _____, _____, _____, _____

Answer:

50, 60, 70, 80, 90 100

Let us Do (Page 26) :

A. On the number chart, use skip counting in two and draw on the numbers. Now use skip counting in five and draw on the numbers in the number chart.

Answer:

B. Write down the numbers that are common to the skips in twos and fives.

Answer:

10, 20, 30, 40, 50, 60, 70, 80, 90, 100

C. Write down the numbers that are common to the skips in twos, threes and fives.

Answer:

30, 60, 90.

D. Write down the numbers common to the skips of fives and sevens?

Answer:

35, 76

Jump and find the answers. Write ‘Yes’ or ‘No’ (Page 26)

Make a number line on the ground and jump on it.

A. If you start from 10 and jump counting in tens, will you land on number 100 at any time?

Answer:

Yes

B. Jump and find out if you start at 5 and count in fives, will you jump on number 40 at any time?

Answer:

Yes

C. If you start from O and count in fives, will you jump on number 55 at any time?

Answer:

Yes

D. If you start from 4 and count in twos, will you jump on number 17 at any time?

Answer:

No

E. If you start from 13 and count in threes, will you jump on number 24 at any time?

Answer:

No

Let us jump backward (Page 27) :

Complete the following patterns.

What comes just before 10?

Answer:

9

What comes just before 9?

Answer:

8

10,9, 8,

Solution:

10, 9, 8, 7, 6, 5, 4, 3, 2, 1

A. 40, 37, 34,

Answer:

40, 37, 34, 31, 28, 25, 22, 19, 16, 13, 10

B. 70, 65, 60,

Answer:

70, 65, 60. 55 50 45 40 35 30

C. 100, 90,

Answer:

100, 90, 80 70 60

D. 100, 80,

Answer:

100, 80, 60 40

Is there a pattern in the given numbers? If not, change the numbers to create a pattern. Also, extend it.

100, 90, 80, 70, 60,

Answer:

100, 90, 80, 70, 60, 50, 40, 30

Let us Talk (Page 28) :

A. Rizwan is counting numbers from 20 onwards. Will he say the number 19 in his count? Explain why?

Answer:

No, because 19 comes before 20.

B. Chavi is counting numbers in twos from 10 onwards. Will she say 43? Explain why?

Answer:

In counting numbers from 10 onwards, we get 40, 42, 44.

So, she will not say 43

C. Mala is counting backwards from 20. How many steps will it take to reach 0? Explain why?

Answer:

From 20 to 0 there are 20 steps so Mala will take 20 steps to reach 0.

D. Viraaj is counting backwards in twos from 20. How many steps will it take to reach 0? Discuss.

Answer:

Viraaj will take 10 steps to reach 0.

Let us Do (Page 29) :

Look at the number chart (see NCERT Textbook, page 28) and write down the answers.

comes just before 10

Answer:

9 comes just before 10

comes just before 20

Answer:

19 comes just before 20

comes just before 30

Answer

29 comes just before 30

comes just before 40

Answer:

39 comes just before 40

Question.

Do you see any pattern? Shade the numbers on the number chart. Does the pattern continue for other numbers? If yes, write the pattern.

Answer:

9, 19, 29, 39, 49, 59, 69, 79, 89, 99

Question.

Now, look at the numbers coloured green in the number chart. Write them.

Answer:

1, 12, 23, 34, 45, 56, 67, 78, 89, 100

Question.

What pattern do you notice? Discuss.

Answer:

The pattern we find is the next number is 11 more than the previous number.

Lakshanya made a number window and placed it on the number chart as shown below.

A. If the centre of the window is placed on 28, which number will be on the top of it?

Answer:

18

B. Which number will be below it?

Answer:

38

C. Which number will be on its right?

Answer:

29

D. Which number will be on its left?

Answer:

27

E. Let us do it for other numbers.

Answer:

F. Based on the same number grids fill the missing numbers.

Answer:

Observe how the number of blocks are increasing in the following shapes and extend the pattern.

A.

Answer:

B.

Answer:

C.

Answer: