## Samacheer Kalvi 3rd Standard Maths Book Solutions Term 3 Chapter 7 Information Processing

Quick ways of adding (Text Book Page No. 49):

Exercise (Text Book Page No. 50):

Find the sum of

i) 5 + 1 + 5 + 9

5 + 5 = 10
9 + 1 = 10
Hence the sum = 10 + 10 = 20

ii) 2 + 5 + 5 + 7 + 1

2 + 7 + 1 = 10
5 + 5 = 10
Hence the sum = 10 + 10 = 20

iii) 3 + 6 + 1 + 2 + 8

3 + 6 + 1 = 10
8 + 2 = 10
Hence the sum = 10 + 10 = 20

Add the given big numbers using the above method (Text Book Page No. 51):

Question 1.

543 = 500 + 40 + 3
210 = 200 + 10

Question 2.

298 = 200 + 90 + 8
501 = 500 + 1

Question 3.

798 = 700 + 90 + 8
654 = 600 + 50 + 4

Question 4.

348 = 300 + 40 + 8
681 = 600 + 80 + 1

Question 5.

543 = 500 + 40 + 3
218 = 200 + 10 + 8

Question 6.

716 = 700 + 10 + 6
540 = 500 + 40 + 0

Quick ways of subtracting (Text Book Page No. 52):

Subtract the given numbers using the above method (Text Book Page No. 53):

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Mental Arithmetic (Text Book Page No. 54):

Able to add and subtract single digit numbers and two digit numbers mentally:

Question 1.
In a tree planting ceremony, 6 coconut saplings and 5 neem saplings are planted. Find the total number of saplings planted.
6 + 5 = 11

Question 2.
There are 5 tender coconuts in a tree. If they pick 3 tender coconuts, then find the remaining tender coconuts?
5 – 3 = 2

Question 3.
46 boys and 27 girls visited a park on Sunday. Find the total number of boys and girls who visited the park?
46 + 27 = 73

Question 4.
50 pens are in a box. Out of which, 34 pens are given to the students. Find the number of pens left?
50 – 34 = 16

Question 5.
70 balls are given to 7 persons. How many balls are given to each person?
70 ÷ 7 = 10 [10 × 7 = 70]

Question 6.
8 books can be arranged in a row. In how many rows can 48 books be arranged?
48 ÷ 8 = 6 [8 × 6 = 48]

Question 7.
10 pens can be kept in a box. How many boxes are needed to keep 100 pens?
100 ÷ 10 = 10

3rd Standard Maths Guide Information Processing Additional Questions and Answers

Question 1.
Find the sum of

(i) 7 + 7 + 3 + 3

7 + 3 = 10 and
7 + 3 = 10
Hence the sum of the number = 10 + 10 = 20

(ii) 6 + 4 + 4 + 6

6 + 4 = 10 and
4 + 6 = 10
Hence the sum of the number = 10 + 10 = 20

Question 2.

Question 3.

Question 4.
Subtract

Question 5.
Subtract

## Samacheer Kalvi 3rd Standard Maths Book Solutions Term 2 Chapter 5 Information Processing

Mark routes for the given locations.

Given below is a map of a town showing some important places/ landmarks. Divya wants to go to library. One of the ways to reach the library from her house is shown below.

Observe the map and answer the following questions.

Question 1.
Name the location she passed in the given route.
Bank and Post office.

Question 2.
From the library, Divya needs to reach pharmacy. Trace the path and name the landmarks between library and pharmacy.
Park, Market, Hospital.

Question 3.
Trace another route from Divya’s house to reach library.

Question 4.
Mention any two places between museum and park.
Pharmacy, Hospital, Market.

Exercise (Text Book Page No. 32):

Help the bus driver by marking the routes in the map to land the bus in bus stand.
Mark all the possible routes and suggest the best route.

Ways:

Question 1.
A → B → C → I → L → E

Question 2.
A → B → C → I → F → K → M

Question 3.
A → B → N → G → J → F → H → M

Question 4.
Write the shortest route.
A → D

Question 5.
Write the longest route.
A → B → N → G → J → F → H → M → K → E → L → D.

The quick way of finding 10 more than and less than a given number.

Colour the table in the next page by skip counting in tens as per the instructions given below.

1. Colour the numbers starting from 12 in blue.
2. Colour the numbers starting from 6 in pink.
3. Colour the numbers starting from 5 in yellow.
4. Colour the numbers starting from 9 in orange.

After colouring observe the table and fill in the blanks.

Question 1.
10 more than 45 is _____.
55

Question 2.
10 less than 45 is _____.
35

Question 3.
10 more than 22 is _____.
32

Question 4.
10 less than 22 is _____.
12

Activity (Text Book Page No. 34):

Complete the blanks.

a.

b.

3rd Standard Maths Guide Information Processing Additional Questions and Answers

Question 1.
Anu wants to go to school, one of the ways to reach the school from her house in shown below.

Observe the map and answer the following questions.

(i) Name the location she passed in the given route.
Bank, park.

(ii) From the school Anu needs to reach post office. Trace the path and name the land marks between school and post office.
Left side in park.

(iii) Trace another route from Anu’s house to reach school.
Right side in Bank.

(iv) Mention any two places between Fire station to hospital.
Market, Pharmacy.

## Samacheer Kalvi 3rd Standard Maths Book Solutions Term 1 Chapter 6 Information Processing

Activity 1 (Text Book Page No. 57):

Let us colour the blocks.

Find all possible ways of colouring the given blocks with blue and red. One is done for you.

Activity 2 (Text Book Page No. 57):

Fill the white space in the given blocks with alternate colours and answer the following questions based on it.

Question 1.
Total number of blocks
10

Question 2.
Number of rose block
4

Question 3.
Number of blocks
6

Question 4.
Number of blocks in 2 and 4 row
1 & 2

Question 5.
How many more than
2

Practice (Text Book Page No. 58):
Question 3.
List down all possible ways of forming three digit numbers by using the given digits only once.

a. 9, 6, 8

b. 3, 2, 0

c. 1, 5, 4

Question 4.
Find all possible ways of combining the three letters a, e, tusing each of them once.

Practice (Text Book Page No. 60):

Question 1.
Collect the data from 40 of your friends about their favourite food and represent it in Picture.

Question 2.
The following picture represents the number of chocolates sold at a shop in a week.

Answer the following questions from the data given in the above table.

Question 1.
The total number of chocolates sold on Thursday is
40

Question 2.
The sale was maximum on
Monday

Question 3.
The sale was minimum on
Saturday

Question 4.
Sale were equal on and
Tuesday, Friday

Question 5.
The total number of Chocolates sold in six days are
180

Question 3.
Collect the data from 40 of your friends about their mode of travel to school and represent it in the picture.

Activity to be done by the students themselves.

Draw a conclusion from the representation by discussing with your teacher.

The graph below shows the number of children in a school studying in classes 1-4 of a school. The number of girls studying in classes 1-4 of a school are 14 10, 16 and 13 respectively. braw the graph discussing with your teacher for number of boys studying in classes 1-4.

After completing the pictorial representation answer the following questions.

i. The number of girls in class 2 is ___________.
10

ii. The number of boys in class 3 is ___________.
15

iii. The total number of students in class 4 is ___________.
29

iv. The total number of girls from class 1 to 4 is ___________.