I am Kittu. This is my home. Isn't it huge? It has 100 rooms.
Help me in painting some of the rooms.
I start from room 2. I add 10 to 2 to reach room 12 and paint it. To add 10 to 2, we can go all the way to the right to 10.
Then up to 11, and one step right to 12.
This is one way to go from 2 to 12.
Is there a shortcut? Of course! Follow me.
We can jump up one row.
A jump from 2 to 12 is like taking steps.Now try one jump up from 14.
14 + 10 = 24 .
Colour this room.How will I go from 22 to 41? Jump from 22 to 42.
Then one step left. We can write it like this.
22 + 20 = 42
42 - 1 = 41
How many steps did I go in all?
You could also go this way:
From 22 take one step left to 21.
Then two jumps up to 41.
22 - 1 = 21
21 + 20 = 41
Try these on Kittu's home:
10 less than 34 is .
53 - 20 =
11 more than 31 is .
11 less than 66 is .
62 + 13 =
23 less than 89 is .
10 and 40 more is
9 added to 28 gives .
The sum of 9 and 44 is .
Reducing 98 by 34 gives .
4 and 37 more is .
Take 35 away from 83. We get .
The 10×10 number grid is a useful aid for adding and subtracting two-digit numbers. Children should be encouraged to try these operations mentally using the grid as often as possible |
Find My Food
Hey! I have something more interesting for you.
Ma told me, there are things to eat in some rooms.
Help me find those room numbers. Mark them in my home.
See what you get!
E.g., 47 = 37 + 10
37 + 9 =
62 - 30 =
= 46 + 28
= 87 - 14
62 - = 43
45 + = 99
+ 26 = 75
- 1 = 1
36 = - 8
43 + = 74
100 = + 50
57 - = 20
Adding Made Easy
Anisha bought apples for 37 rupees. Raja bought bananas for 21 rupees. The woman selling fruits said:
37 is 30 and 7
21 is 20 and 1
So 37 and 21 make 58.
Let us also try. Look at this sum.
20 | + | 6 | + | 40 | + | 3 |
20 | + | 40 | + | 6 | + | 3 |
The answer is 69
Can you do it another way? Say how.
33 + 56 = 30 + 3 + 50 + 6
= 80 + 3 + 6
= 80 + 9 = 89
See if you can do the same with these sums.
37 + 22 = 30 + 7 + 20 + 2
= ____________ + ___________ +_____________
73 + 24 = ____________ + ____________ + ___________ + ___________
= ____________ + ____________ + ____________ 
= __________ + _____________ = ___________ 
MANGO CHILLI GAME
Use a pair of dice (or ten tamarind seeds). Keep a different coloured button for each player. If you reach a mango you go forward (+). If you step on a chilli you have to go back (-). See who reaches back home first !
56 + 21 = -------------- + --------------+ -----------+ ------------
= -------------+ ------------+ -------------
= ------------+ ----------- = ------------
Now work out the steps in your mind.
Write the answers directly in the boxes.
33 + 42 = | = 33 + 27 | 55 + 25 = |
19 + 61 = | = 34 + 63 | 67 + 25 = |
= 48 + 42 | = 53 + 64 | 72 + 56 = |
Once a baby lion lost his way in the jungle. He started crying and called out for his mother. An old deer took pity on him. He took him to his place. But the other deer got really scared. So did their other friends - rabbits, squirrels and birds. A lion among us! Oh, no! He will eat up our babies. The old deer said - don't worry. I will warn him about this. In the morning the baby lion thanked every one and started to leave, But a rabbit said - wait, he cannot go like this! Let us count to see if he has done any mischief. We should be 240 in all. Let's count.
In the chapter Fun with Numbers, children would have made token cards. The same token cards should be used for exercises in addition before children do written sums. |
Let's add and find out how many deer and rabbits were there...
Putting all the 
s together,we get fifteen s
Ten s make one 
and we are left with five
Now putting together all the s, we get seven s
So total number of 
and 
= 75
Similarly we add the number of birds and number of squirrels.
Putting all the s together first and grouping them
Then putting together the s and lastly the 
s we get
So together birds and squirrels were 162, and deer and rabbits were 75.
The old deer said - we were 240 in number, now how many are we in all?
To find out, do the addition in the box below:
How Many Bulbs?
A factory makes 270 bulbs on the first day. On the second day it makes 123 bulbs.
How many bulbs does the factory make altogether?A shopkeeper Rafi had 153 candles. Paras gave him 237 more candles. How many candles does Rafi have now?
A train compartment is carrying 132 people. Another compartment is carrying 129 people. In all, how many people are there in both the compartments?
Shanu found 138 pebbles. Karim found 44 pebbles. How many pebbles did they find in all?
A teacher kept a note of which fruits students like in her school. This is what she found:
First day - 270 bulbs
Second day - 123 bulbs
Solution:
Work out the following story problems in the same way.
Read each problem and say it in your words.
Guess the answer before writing it.
Find out:
How many students in the school like oranges?
How many students in the school like mangoes?
Altogether, how many students are there in the school?
Is the number of girls more than 350 or less than 350?
We never have a fight
When I am done
Call out to him
And check if I am right
MIND TRAIN GAME :
Two friends play this game. You look at each train. Some people come in (+) and some leave (-).
How many are there in all? Solve in your MIND! Discuss youranswer.
The friend who gets the right answer first wins some points. List down your points. Add to find who wins the most!
Work out four different ways to write the numbers
Can You Solve this Puzzle?
Write the numbers 1, 2, 3, 4, 5, 6 in the circles, so that the sum of the numbers on each side of the figure is 12.
Find Mithoo's Bag
Do all the sums mentally:
75 + 20 = 95
90 + 60 = 150
25 + 30 + 3 =
9 + 40 + 31 =
500 + 200 =
400 + 350 =
37 + 46 + 3 =
670 + 120 =
380 + 210 =
205 + 650 =
128 + 600 =
150 + 69 =
Find Mithoo's bag and check your answers.
Draw a line through the numbers which are answers written in the boxes above.
Card Game
One day Bubbly and Gopu were playing. Bubbly gave three number cards to Gopu. He arranged the cards in two ways.
Bubbly arranged them this way:
Isn't it interesting?
You can also play it. Here are the cards for you. Work out the combination. Place the cards in the right boxes.
50 70 20 50 20 70 ________ + ________ = ________ ________ + ________ = ________ ________ + ________ = ________ ________ + ________ = ________ 30 42 12 30 42 12 ________ + ________ = ________ ________ + ________ = ________ ________ + ________ = ________ ________ + ________ = ________
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