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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 Presentation
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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


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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:. Using a spreadsheet to find fractions of numbers. Lesson Objectives:.

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Presentation Transcript
slide1

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.
slide2

Mental starter:

Using a spreadsheetto find

fractions of numbers.

slide3

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.
slide5

Example problem

numerator

quantity

3

of £2

4

denominator

slide6

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

slide7

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

slide8

Which method is better? Why?

  • Is one method always better than the other?
slide9

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

slide10

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.