Formulae
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If a = 3 and b = 9 evaluate PowerPoint PPT Presentation


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Formulae. If a = 3 and b = 9 evaluate. a + b. Sub in a=3. =. 3. +. 9. Sub in b=9. =. 12. Formulae. If a = 3 and b = 9 evaluate. ab. a x b. Remember ab means a x b. Sub in a=3. =. 3. 9. x. Sub in b=9. =. 27. Formulae. If a = 3 and b = 9 evaluate. 4b. 4 x b.

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If a = 3 and b = 9 evaluate

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If a 3 and b 9 evaluate

Formulae

If a = 3and b = 9evaluate

a + b

Sub in a=3

=

3

+

9

Sub in b=9

=

12


If a 3 and b 9 evaluate

Formulae

If a = 3and b = 9evaluate

ab

a x b

Remember ab means a x b

Sub in a=3

=

3

9

x

Sub in b=9

=

27


If a 3 and b 9 evaluate

Formulae

If a = 3and b = 9evaluate

4b

4 x b

Remember 4b means 4 x b

=

4

9

x

Sub in b=9

=

36


If a 3 and b 9 evaluate

Formulae

If a = 5and b = 3evaluate

2a + 4b

2xa + 4xb

=

Remember 2a means 2 x a

Sub in a=5

4x

3

=

2x

5

+

Sub in b=3

=

10

12

+

=

22


If a 3 and b 9 evaluate

Formulae

If a = 5and b = 3evaluate

a

2

a x a

=

Remember a2 means a x a

Sub in a=5

=

5

5

x

=

25


If a 3 and b 9 evaluate

Formulae

If a = 15 and b = 3 evaluate

a

15

=

b

3

Sub in a = 15

Sub in b = 3

=

5


Formulae

Formulae

A formula is the process calculating a quantity based on a known relationship e.g. Length, Area, Volume etc........

It is VERY important that we remember a keypoint

when working with formulae.

B

Brackets

O

Other  squares and square root etc....

D

Divide

M

Multiplication

A

Addition

S

Subtraction


If a 3 and b 9 evaluate

Formulae

Sometimes formulae are expressed in words.

A tile fitter charges £20 per hour.

How much will he charge for 8 hours of work.

C =

20xh

For h = 8

C = 20 x 8 =

£160


If a 3 and b 9 evaluate

Formulae

The cost for hiring a carpet cleaner is

£30 plus £3 a day

How much will it cost to hire for a week.

C =

30

+

3d

For d = 7

£51

C = 30 + 3 x 7 =


If a 3 and b 9 evaluate

Formulae

Profit :

Subtract how much you paid for goods in the first place from the amount you actually sold them for.

How much profit did Daniel make if he bought a CD for £9.99 and sold it for £12

Profit (P) =

Cost Price

Selling Price –

£2.01

P = 12 – 9.99 =


If a 3 and b 9 evaluate

6

2

4

5

1

3

9

3

1 Table

2 Tables

3 Tables

3

3

3

3

Simple Linear Patterns using diagrams and tables

Fill empty boxes

Number of Tables

Step 1 :

Number of Surfers

12

15

Step 2 : Find difference

What is the formula

Same difference

linear pattern


If a 3 and b 9 evaluate

Number of Tables

Number of Surfers

12

15

3

4

5

2

3

6

9

1

3

3

3

3

HINT : Let the number of surfers be the letter S

and the number of tables be the letter T

Step 3 :

Can you write down formula connecting

the number of surfers and the number of tables.

Simple Linear Patterns using diagrams and tables

S = 3 x T

S = 3T


If a 3 and b 9 evaluate

Simple Linear Patterns using diagrams and tables

Key-Points

Write down the 3 main steps

1.Make a table

2.Find the difference

3.Use the difference to write

down the formula


Complicated linear patterns using diagrams and tables

Complicated Linear Patterns using diagrams and tables

3 Tables

1 Table

2 Tables

8

4

2

3

1

5

4

6

2

2

2

2

Fill empty boxes

Number of Tables

Step 1 :

Number of Surfers

10

12

Step 2 : Find difference

What is the formula

Same difference

linear pattern


Complicated linear patterns using diagrams and tables1

Complicated Linear Patterns using diagrams and tables

Number of Tables

Number of Surfers

10

12

6

5

1

4

2

4

8

3

2

2

2

2

S = 2 x T

Part of the Formula

Find a number

so formula works

Step 3 :

Step 4 :

S = 2T + 2

Correction factor “add on 2”


Complicated linear patterns using diagrams and tables2

Complicated Linear Patterns using diagrams and tables

Key-Points

Write down the 4 main steps

1.Make a table

2.Find the difference

3.Write down part of formula

4.Find the correction factor and

then write down the full formula


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