Lesson 7 Exchange Rates and Conversion graphs. Mathswatch 64

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Lesson 7 Exchange Rates and Conversion graphs. Mathswatch 64. 1) Find the median and range of the stem and leaf below. Which of the shapes below are congruent?. GCSE Maths Starter 7. A. B. E. Expand x(x + 3) Evaluate 32.9 x 17 (no calc ) Increase \$72 by 15% (no calc ). C. D.

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

Which of the shapes below are congruent?

### GCSE Maths Starter 7

A

B

E

Expand x(x + 3)

Evaluate 32.9 x 17 (no calc)

Increase \$72 by 15% (no calc)

C

D

### 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

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)

### 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)