teaching primary children about the topic

1. AREA, PERIMETER AND VOLUME
JBl© 2012

2. CM, CM² AND CM³
 3cm means a line 3 centimetres long
 3cm² means a two dimensional box made of 3 one
centimetre squares
 3cm³ means a three dimensional shape made of three
one centimetre cubes

3. PERIMETER
The distance all the way round a shape.
10 + 10 + 16 = ?
5cm
10cms
12cm
12 + 12 + 5 + 5 = 34cms
16m

4. PERIMETER
These are more common shapes to deal with in the
11+
4cm
12cm
4cm
9cm

5. PERIMETER
These are more common shapes to deal with in the
11+
3cm
12cm – 4cm = 8cm
9cm – 3cm = 6cm
12cm
4cm
4 + 8 + 6 + 3 + 9 + 12 = 42cms
9cm click here

6. PERIMETER
These are more common shapes to deal with in the
11+
2cm
[5 x 4 = 20] + [8 x 2 = 16] = 36cms
5cm

7. AREA – THE UNITS²
The number of squares contained inside the shape
15 x 10 = 150
5cm ½ it = 75cms²
12cm
15cm
5 x 12 = 60cms²
10cm click here

8. VOLUME – THE UNITS³
The number of cubes inside the 3D shape
4cms
5cms
8cms 10cm
8 x 4 x 5 = 160cms³ 12cm
4cm
10 x 4 = 40, ½ it = 20 x 12 = 240cms³
click here

9. OVER TO YOU………..
Try these ones yourself and show me next week:
1. What is the volume of a 4cm cube?
2. The volume of a cuboid 3cm by 2cm by 7 cms
3. The area of a triangle with a base of 9 cms and a height of 12cms
4. An isosceles triangle who’s height is 4cm and base is twice as long.
5. The area of a square, sides 7cm
6. What is the length of the side of a square whose area is 81cms²?
7. The perimeter of an equilateral triangle whose side is 11 cm
5cm
8. Calculate the perimeter and area of this shape
12cm
9cm
16cm