Estimating Area worksheet for students to practice estimating the area of irregular shapes on grid paper.

- Count the number of full squares inside each shape.
- For partially filled squares, estimate how much of each square is covered. A common method is to count any square that is more than half covered as one full square, and ignore squares that are less than half covered.
- Add the counts of full squares and estimated partial squares to get the total estimated area in cm².

For problem 2:
- Since each square represents 10 cm², divide the target area by 10 to find how many squares to cover.
- For 180 cm², you need to cover 18 squares (180 ÷ 10 = 18).
- For 350 cm², you need to cover 35 squares (350 ÷ 10 = 35).
- Draw an irregular shape on the grid that covers approximately that number of squares.