Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
GCSE Maths Starter 7
2. Expand x(x + 3)3. Evaluate 32.9 x 17 (no calc)4. Increase $72 by 15% (no calc)
5. Which of the shapes below are congruent?
1) Find the median and range of the stem and leaf below.
A
D
B
EC
• To interpret conversion graphs.• To calculate the conversion between two
types of units.• To solve problems involving conversions.EXTN: To establish best value using conversion of units. (Grade C)
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
Why would you convert currency?
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
What is an exchange rate?
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
I know £1 = ฿43.56 (Thai Baht) what would I do to find how much £100 is?
So to convert between £ and ฿ you need to x 43.56
X 43.56
£1 = ฿43.56
Convert the following amounts to Thai Baht.a) £10 b) £50 c) £135
£100 x 43.56 Baht = 4356 Baht
435.60 Baht 2178 Baht 5880.60 Baht
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
X 43.56 X 43.56 X 43.56
I know £1 = ฿43.56 (Thai Baht) how would I work out how many pounds, 1000 Baht is?
So to convert between £ and ฿ you need to ÷ 43.56
÷ 43.56
£1 = ฿43.56
Convert the following amounts to British Pounds (GBP).a) 200 Baht b) 1400 Baht c) 70 Baht
1000 Baht ÷ 43.56 = £22.95684114= £22.96
£4.59 £32.14 £1.61
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
÷ 43.56 ÷ 43.56 ÷ 43.56
New York, USA £1 = $1.51 I now take my family to New York. I
convert £350 to US Dollars. a) Calculate how many US dollars I
have?
b) I spend $276 on my visit to New York and return to England. I convert my remaining money to Pounds. Calculate the remaining to GPB (£)?
350 x 1.51 = $528.50
$528.50 - $276 = 252.50 252.50 ÷ 1.51 = £167.22
Sydney, Australia £1 = $1.45 I now take my family to Sydney. I
convert £1200 to Australian Dollars.a) Convert £1200 to Aussie Dollars?
b) I spend $1476 Dollars whilst in Sydney. I convert the remaining currency back to Pounds. How many pounds and pence do I have?
1200 x 1.45 = $1740
$1740 - $1476 = $ 264 $264 ÷ 1.45 = £182.07
In the UK, petrol cost £1.24 per litre. In the USA, petrol cost 3.15 dollars per US
gallon.
1 US Gallon = 3.79 Litres£1 = $1.51
UK or USA? Show why?
In the UK petrol is £1.24 per litre.1.24 x 1.51 = $1.87 per litre (convert to US dollars)
In the US Petrol is $3.15 per gallon3.15 ÷ 3.79 = $0.83 per litre
So we see that petrol is cheaper in the US
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
EXAMPLES1) 2)
Use the conversion graph to convert:(a) 70 kg to pounds(b) 120 pounds to kg
Use the conversion graph to convert:(a) 30 gallons to litres(b) 400 litres to gallons
154 lbs
154 pounds
54 kg
54 kg
137 litres
88 gallons
137 litres88 gallons
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
1)
10cm
23cm
2in
8.75in
2.5cm
Read off the value for 9in (23cm) and multiply this by 2 (46cm)
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
• To interpret conversion graphs.• To calculate the conversion between two
types of units.• To solve problems involving conversions.EXTN: To establish best value using conversion of units. (Grade C)
Lesson 7 Exchange Rates andConversion graphs.
Mathswatch 64
