if a = 3 and b = 9 evaluate
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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. - PowerPoint PPT PresentationTRANSCRIPT
If a = 3 and b = 9 evaluate
a + b
3 +9=
= 12
Sub in a=3Sub in b=9
FormulaeFormulae
If a = 3 and b = 9 evaluate
ab
Sub in a=3Sub in b=9
Remember ab means a x b
a x b
3 x 9=
= 27
FormulaeFormulae
If a = 3 and b = 9 evaluate
4b
Sub in b=9
Remember 4b means 4 x b
4 x b
4 x 9=
= 36
FormulaeFormulae
If a = 5 and b = 3 evaluate2a +
4bSub in a=5Sub in b=3
Remember 2a means 2 x a
2xa + 4xb
2x5 +4x3
=
=
= 10 + 12= 22
FormulaeFormulae
If a = 5 and b = 3 evaluatea
Sub in a=5
Remember a2 means a x a
a x a
5 x 5
=
=
= 25
2
FormulaeFormulae
If a = 15 and b = 3 evaluate
aSub in a = 15
153
=
= 5
bSub in b = 3
FormulaeFormulae
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.
BODMAS
Brackets
Other squares and square root etc....
Divide
Multiplication
Addition
Subtraction
Sometimes formulae are expressed in words.
Formulae
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
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
C = 30 + 3 x 7 =
£51
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
P = 12 – 9.99 =£2.01
Profit (P) =Selling Price – Cost Price
Simple Linear Patterns Simple Linear Patterns using diagrams and using diagrams and
tablestables
1 Table 3 Tables2 Tables
2 4 51 3Number of Tables
6 12 15
3 9Number of Surfers
Step 1 :
Fill empty boxes
3 3 3 3
Same differencelinear pattern
What is the formula
Step 2 : Find difference
Simple Linear Patterns Simple Linear Patterns using diagrams and using diagrams and
tablestables
2 4 51 3Number of Tables
6 12 15
3 9Number of Surfers
3 3 3 3
Can you write down formula connectingthe number of surfers and the number of tables.
S = 3 x T
S = 3T
HINT : Let the number of surfers be the letter S and the number of tables be the letter T
Step 3 :
Simple Linear Patterns Simple Linear Patterns using diagrams and using diagrams and
tablestables
Key-PointsKey-PointsWrite down the 3 main steps
1. Make a table
2. Find the difference
3. Use the difference to write down the formula
2 4 51 3Number of Tables
6 10 12
4 8Number of Surfers
Step 1 :
Fill empty boxes
2 2 2 2
Same differencelinear pattern
What is the formula
1 Table 3 Tables2 Tables
Complicated Linear Patterns Complicated Linear Patterns using diagrams and tablesusing diagrams and tables
Step 2 : Find difference
2 4 51 3Number of Tables
6 10 12
4 8Number of Surfers
2 2 2 2
S = 2T + 2
Complicated Linear Patterns Complicated Linear Patterns using diagrams and tablesusing diagrams and tables
S = 2 x TPart of the Formula
Correction factor “add on 2”
Find a number
so formula works
Step 3 :
Step 4 :
Key-PointsKey-Points
Write down the 4 main steps
1. Make a table
2. Find the difference
3. Write down part of formula
Complicated Linear Patterns Complicated Linear Patterns using diagrams and tablesusing diagrams and tables
4. Find the correction factor and then write down the full formula