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practice time 11C

Estimate the area of the following irregular figures. Take area of 1 square = 1 sq. cm.

1. 2. 3.

4. 5. 6.

Critical Thinking
Mental Maths
Some shapes are drawn on square grid paper as shown below.

F
A B C
D E
G I
H J K

The areas of the shapes are given in the table. Identify them.

Area (in sq. units) 15 7 1 18 9 6
2
Shapes

Challenge Question Critical Thinking

Determine the area of the table surface left exposed when a rectangular tablecloth
measuring 80 cm by 40 cm is placed so that it leaves an 8 cm margin on every side.

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