This lesson contains 15 slides, with interactive quiz and text slides.

Lesson duration is: 45 min

Items in this lesson

Last week

- Quantities and units

- Units of length

- Converting units

- Scale

Measuring

Slide 1 - Slide

We know:

... what an area is and what perimeter is. ... different units of area.

... how to convert units of area.

... how to calculate the area of a rectangle.

Measuring

Slide 2 - Slide

AREA

PERIMETER

8 ha

(=8hm²)

??

2.8km

??

Slide 3 - Slide

The perimeter of a shape is the total length of the edges.

40+22+20+40+31 = 153 cm

Slide 4 - Slide

Area is about how much space is covered.

The area of a shape is how many times the unit of area fits onto it.

Slide 5 - Slide

Units of area

Slide 6 - Slide

Units of area

80 dm² = ... m²

80 dm² = 0.8m²

4.5 m² = ... cm²

4.5 m² = 450 dm²

4.5 m² = 45,000 cm²

Slide 7 - Slide

Area of a rectangle

1

2

Slide 8 - Slide

Area of a rectangle

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.

b) Calculate the perimeter and the area of a square with sides measuring 5 m.

timer

5:00

finished?

> exercises 17c,d, 18

Slide 9 - Slide

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm. b) Calculate the perimeter and the area of a square with sides measuring 5 m.

Slide 10 - Open question

Area of a rectangle

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.

b) Calculate the perimeter and the area of a square with sides measuring 5 m.