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Maths
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438315
Mind Map
by
ilieve
, created
almost 6 years ago
This is a mind map you can may use to revise
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grade 7 mid-year
maths
Created by
ilieve
almost 6 years ago
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Resource summary
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Maths
1 Algebra
1.1 Multiplaying
1.1.1 times everything together, even the letters
1.1.1.1 12p x 6 x c
1.1.1.1.1 =(12 x 6) x (p x c)
1.1.1.1.1.1 =72 x pc
1.1.1.1.1.1.1 =72pc
1.1.1.2 8c x -6 x cb
1.1.1.2.1 =-48c x cb
1.1.1.2.1.1 =-48bc^2
1.2 Dividing
1.2.1 cancel like terms, and divide the rest
1.2.1.1 =5a÷ab
1.2.1.1.1 cancel out the a's
1.2.1.1.1.1 =5÷b
1.3 adding and subtracting
1.3.1 collect like terms
1.3.1.1 5a+7c+a-3c
1.3.1.1.1 =(5a+a)+ (7c-3c)
1.3.1.1.1.1 =6a+4c
2 percentage
2.1 commission
2.1.1 the percentage of the value goods sold
2.1.1.1 if a salesperson sells $1000 value of goods and the commission is 4%
2.1.1.1.1 4 ------- x 1000 100
2.1.1.1.1.1 $40
2.2 simple intrest
2.2.1 The amount of money x the percentage per annum x the amount of years _________________________ 100
2.2.1.1 $800 at 11% p.a. for 2 years
2.2.1.1.1 cancel out the two zero's from the 800 (because it is divided by 100)
2.2.1.1.1.1 (8 x 11)2
2.2.1.1.1.1.1 88 x 2
2.2.1.1.1.1.1.1 176
2.3 percentage change
2.3.1 increasing and decreasing a number
2.3.1.1 decreasing $100 by 30%
2.3.1.1.1 100 - 30= 70
2.3.1.1.1.1 70 --------- x 100 100
2.3.1.1.1.1.1 $70
2.4 Finding a quantity if the percentage is known
2.4.1 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%.
2.4.1.1 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
2.4.1.1.1 34% of the runs = 102 1% of the runs = 102 ÷ 34 =3
2.4.1.1.1.1 100% of the runs = 3 x 100 = 300
2.4.1.1.1.1.1 The Australian team scored 300 runs
3 Ratios and Rates
3.1 Ratios
3.1.1 comparing something from the same unit
3.1.1.1 6:10
3.1.1.1.1 The ratio always has to be in its simplest from, except when you want to see the ratio from a quantity
3.1.1.1.2 3:5
3.2 Rates
3.2.1 comparing something from a different unit
3.2.1.1 12cm/hr
3.2.1.1.1 The last number always has to be one
3.2.1.1.1.1 NOT 36 cm/3hr THIS IS WRONG
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