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Lesson 7 Exchange Rates and Conversion graphs. Mathswatch 64

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### GCSE Maths Starter 7

### Lesson 7 Exchange Rates andConversion graphs.Mathswatch 64

### Lesson 7 Exchange Rates andConversion graphs.Mathswatch 64

1) Find the median and range of the stem and leaf below.

Which of the shapes below are congruent?

A

B

E

Expand x(x + 3)

Evaluate 32.9 x 17 (no calc)

Increase $72 by 15% (no calc)

C

D

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

I know £1 = ฿43.56 (Thai Baht) what would I do to find how much £100 is?

X 43.56

£1 = ฿43.56

£100 x 43.56 Baht = 4356 Baht

So to convert between £ and ฿ you need to x 43.56

Convert the following amounts to Thai Baht.

a) £10 b) £50 c) £135

X 43.56

X 43.56

X 43.56

5880.60 Baht

435.60 Baht

2178 Baht

Lesson 7 Exchange Rates andConversion graphs.Mathswatch 64

I know £1 = ฿43.56 (Thai Baht) how would I work out how many pounds, 1000 Baht is?

÷ 43.56

1000 Baht ÷ 43.56

= £22.95684114

= £22.96

£1 = ฿43.56

So to convert between £ and ฿ you need to ÷ 43.56

Convert the following amounts to British Pounds (GBP).

a) 200 Baht b) 1400 Baht c) 70 Baht

÷ 43.56

÷ 43.56

÷ 43.56

£4.59

£32.14

£1.61

New York, USA £1 = $1.51

I now take my family to New York. I convert £350 to US Dollars.

- Calculate how many US dollars I have?
- 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.

- Convert £1200 to Aussie Dollars?
- 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?

Lesson 7 Exchange Rates andConversion graphs.Mathswatch 64

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 gallon

3.15 ÷ 3.79 = $0.83 per litre

So we see that petrol is cheaper in the US

Lesson 7 Exchange Rates andConversion graphs.Mathswatch 64

EXAMPLES

1)

2)

154 lbs

137 litres

88 gallons

54 kg

Use the conversion graph to convert:

(a) 30 gallons to litres

(b) 400 litres to gallons

Use the conversion graph to convert:

(a) 70 kg to pounds

(b) 120 pounds to kg

137 litres

154 pounds

88 gallons

54 kg

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)

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)

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