Lesson Worksheet: Area of Irregular Shapes Mathematics • 3rd Grade
In this worksheet, we will practice estimating the areas of some irregular shapes using a grid of unit squares.
Q1:
Anthony wants to fill his flower bed with new plants. Each plant needs one square unit of space.
How many flowers should he buy?
Remember to make an estimate by adding the smaller parts to make whole square units.
- A13 plants
- B8 plants
- C5 plants
- D28 plants
- E20 plants
Q2:
Estimate the area of the given figure.
- A34
- B42
- C16
- D26
- E22
Q3:
Estimate the area of the figure.
- A33
- B23
- C26
- D30
- E20
Q4:
Which is the best estimate of the area of the figure?
- A23.5
- B30.5
- C50
- D38.5
- E27.5
Q5:
Estimate the area of the shaded part.
- A39.5
- B20.5
- C15
- D24.5
- E31.5
Q6:
A landscape architect designed a pond. Estimate its area.
- A58
- B42
- C53
- D50
- E45
Q7:
Select the shape which has the largest area.
- A
- B
- C
- D
- E
Estimate the area of the largest shape (to the nearest whole square unit).
- A16
- B17
- C12
- D14
- E15
Q8:
Which is the best estimate for the area of this shape? Remember that the area of each small square is 1.
- A60
- B62
- C58
- D40
- E44
Q9:
Find the area of the octagon giving the answer to the nearest square unit.
Q12:
The diagram shows the floor plan for a tree house. One square on the grid represents 1 square foot. About how many square feet is the area of the floor?
Q16:
In the diagram each square represents 10 square centimeters. What is the area of the colored shape?
