# Maths Week 2 Lesson 1 work

```Maths Week 2 Lesson 1 work
Warm up:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
1+4=5
38+62=100
1
128-10=118
120+90=210
124=90+34
610-606=4
1&times;7=7, so 7&divide;1=7
11:07
18 minutes
Area
Area is a measure of surface and is often referred to as the amount of space contained inside a twodimensional space.
The common metric units for are include:
Square millimetres (mm&sup2;)
Square centimetres (cm&sup2;)
Square metres (m&sup2;)
Square kilometres (km&sup2;)
Hectares (ha)
1. Convert 0.248 m&sup2; to cm&sup2;
0.248𝑚&sup2; = 0.248 &times; 10000
= 2480 𝑐𝑚&sup2;
2. Convert 1 mm&sup2; to cm&sup2;?
1 𝑚𝑚&sup2; = 1 &divide; 100
= 0.01 𝑐𝑚&sup2;
Finding areas of shapes
Square-Area=length x length
E.g. A= l2
= 3 x 3= 9cm2
Rectangle- Area= length x width or A=lw
E.g. A=lw
= 7 x 3= 21m2
Triangle- Area=1/2 base x height or A=1/2bh
E.g. A= 1/2bh
= &frac12; of (10 x 7)
=70&divide;2= A=350mm2
A triangle has area 20 cm2 and base 4 cm. Calculate its height.
A = &frac12; (b x h)
20= &frac12; (4 x h)
20= 2 x h
20 &divide; 2 = h
10 = h
The height is 10 cm
Skill development practice
4a. 2cm2 = 200mm2
4d. 3ha=30000m2
4g. 3090mm2=309cm2
4j. 450000m2= 450km2
4m. 320000m2= 32ha
4p. 4802cm2= 48.02 m2
4s. 0.0049ha= 49m2
5a. A=l2= 3 x 3=9cm
5b. A= l x w= 7 x 3 = 28m
5c= A=1/2bh= &frac12;(13 x 6)=1/2 of 78=39 cm
7a. 22mm2
7b. 0.0473cm2
7c. 340km2
```