Page 102 - Mathematics_Std_4

3. Divide the length of the rectangle into small strips of 1
cm each.

4. Identify squares with side length of 1 cm obtained in
Step 3.
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5. Count the small squares in Step 4 and write their
number.
6. How many squares have you obtained?

7. What is the area of each square in square centimetres.
8. What is the area of the rectangle in square centimetres?

In Activity 1, you have learnt that the area of the rectangle is
obtained by counting small squares in that rectangle. Thus, the
area of the rectangle of your choice is equal to the number of
small squares obtained. Also, the area of a rectangle is obtained

by counting numbers of small squares in the length side and width
side. If the number of small squares in the length side is multiplied
by that of width side, the answer will be the total number of small
squares in the rectangle. Thus, the area of the rectangle is

length × width. That is the area of a rectangle = length × width.

Example 1

Find the area of the following rectangle.
9 cm

5 cm

Solution

Area of a rectangle = length × width
= 9 cm × 5 cm
2
= 45 cm .
Therefore, the area of the rectangle is 45 cm .
2

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MATHEMATICS STD 4 PB 2024.indd 95