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Starter. Percentages. Public and uniformed services. What percentages are used in the uniformed services?. Percentages – what are they. To think of it as money...... 10% is 10p in the pound (100p) 20% is 20p in the pound Percent means out of 100. How to calculate a percent of an amount.

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Starter

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## Percentages

### Public and uniformed services

• What percentages are used in the uniformed services?

### Percentages – what are they

• To think of it as money......

• 10% is 10p in the pound (100p)

• 20% is 20p in the pound

• Percent means out of 100

### How to calculate a percent of an amount

• Divide the amount by 100 and multiply it by the percent you are looking for.

• So to find 10% of some thing divide the amount by 100 to find 1% and multiply it by 10.

• So to find 25% of something divide it by 100 and multiply it by 25

• 10% of £50

• 25% of 100km

• 40% of \$90

• 65% of 150

### Making a percentage

• A switchboard takes 10 calls for an ambulance and 30 for the fire brigade, what percentage of calls are for ambulances?

• How do we do it?

• How many things (in this case phone calls) altogether?

• 10 + 30 = 40, then divide the number of the thing we are after by the total number and multiply by 100

• So.....10 ÷ 40 × 100 = 25%

### Some for you to try

• 60 ambulances do not make it to the patient within 7 minutes, 240 do, what percentage make it on time?

• 10 police cars, 20 riot vans and 20 mounted police are at a football match, what percentage are cars?

• 80 officers are combat trained and 40 are not, what percentage are combat trained?

### Fractions decimals and percentages

• ¼ is 1 ÷ 4 = 0.25

• Didn’t we just say, to find a percent, it’s the bit we have/need, divided by the total and multiply by 100?

• So ¼ is 1 ÷ 4 = 0.25 then 0.25 × 100 = 25%

• So ½ is 1 ÷ 2 = 0.5 then 0.5 × 100 = 50%

### Class practice - wordier

• Tammy is going on holiday and has to pay a 20% deposit, her holiday costs £1500, how much would she need to pay?

• £1500 ÷ 100 = £15

• £15 × 20 = £300

• Tammy would need to pay a £300 deposit