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438315
Maths
Descrição
This is a mind map you can may use to revise
Sem etiquetas
grade 7 mid-year
maths
maths
grade 7
Mapa Mental por
ilieve
, atualizado more than 1 year ago
Mais
Menos
Criado por
ilieve
mais de 10 anos atrás
41
2
0
Resumo de Recurso
Maths
Algebra
Multiplaying
times everything together, even the letters
12p x 6 x c
=(12 x 6) x (p x c)
=72 x pc
=72pc
8c x -6 x cb
=-48c x cb
=-48bc^2
Dividing
cancel like terms, and divide the rest
=5a÷ab
cancel out the a's
=5÷b
adding and subtracting
collect like terms
5a+7c+a-3c
=(5a+a)+ (7c-3c)
=6a+4c
percentage
commission
the percentage of the value goods sold
if a salesperson sells $1000 value of goods and the commission is 4%
4 ------- x 1000 100
$40
simple intrest
The amount of money x the percentage per annum x the amount of years _________________________ 100
$800 at 11% p.a. for 2 years
cancel out the two zero's from the 800 (because it is divided by 100)
(8 x 11)2
88 x 2
176
percentage change
increasing and decreasing a number
decreasing $100 by 30%
100 - 30= 70
70 --------- x 100 100
$70
Finding a quantity if the percentage is known
If a percentage of a quantity is known, to find the quantity we first find the 1% (or 10%) and then we multiply it to find the 100%.
In one-day cricket match Ricky Ponting, Australia's capitian, scored 102 runs, If this was 34% of the team's runs, what did the team scored
34% of the runs = 102 1% of the runs = 102 ÷ 34 =3
100% of the runs = 3 x 100 = 300
The Australian team scored 300 runs
Ratios and Rates
Ratios
comparing something from the same unit
6:10
The ratio always has to be in its simplest from, except when you want to see the ratio from a quantity
3:5
Rates
comparing something from a different unit
12cm/hr
The last number always has to be one
NOT 36 cm/3hr THIS IS WRONG
Anexos de mídia
maths_man.gif (image/gif)
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