To calculate a fraction of a number mentally. To find a fraction of a quantity. To choose a way of working out and give

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# To calculate a fraction of a number mentally. To find a fraction of a quantity. To choose a way of working out and give - PowerPoint PPT Presentation

Lesson Objectives:. To calculate a fraction of a number mentally. To find a fraction of a quantity. To choose a way of working out and give a reason why that method was chosen. Mental starter:. Using a spreadsheet to find fractions of numbers. Lesson Objectives:.

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## To calculate a fraction of a number mentally. To find a fraction of a quantity. To choose a way of working out and give

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Lesson Objectives:

• To calculate a fraction of a number mentally.
• To find a fraction of a quantity.
• To choose a way of working out and give a reason why that method was chosen.

Mental starter:

fractions of numbers.

Lesson Objectives:

• To find a fraction of a quantity.
• To choose a way of working out and give a reason why that method was chosen.

Example problem

numerator

quantity

3

of £2

4

denominator

Method 1

3

of £2

4

First of all divide the quantity by the denominator of the fraction: £2 divided by 4 = 50p

Next, multiply your answer by the numerator: 50p x 3 = £1.50

Method 2

3

of £2

4

First, convert the fraction to a decimal: 3/4 = 3 divided by 4 = 0.75

Next, multiply your answer by the quantity: 0.75 x £2 = £1.50

Which method is better? Why?

• Is one method always better than the other?

On your white board solve these problems using both

methods, discuss quietly with the person next to you which

method you think is better.

Be prepared to share what you’ve learnt.

Work out:

1. 3/4 of £20 2. 2/3 of £180

3. 3/4 of £28 4. 2/5 of £50

5. 4/5 of £60 6. 3/8 of £80

7. 5/8 of £80 8. 4/7 of £490

Lesson Objectives:

• To find a fraction of a quantity.
• To choose a way of working out and give a reason why that method was chosen.