Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**sweetangel786****Member**- Registered: 2006-03-18
- Posts: 20

hi there...,

i need help in maths , i don't like maths i find it a *little* bit hard for me to understand..

i have understood most of the answers i have recieved from my previous questions, i have my mock exams on tuesday and i want to do well in then and pass.

i need help on with: greater then and less than symbols, percentages, how to work out fractiions, and to collect like terms and extend brackets and to simplify them..

i would appreciate if i could get as much help from people to help me with my problems..:cool:

fnx...

practise makes people perfect, but nobody's perfect so why practise...

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**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 23,045

Hi sweetangel786,

a<b indicates a is less than b.

c>d indicates c is greater than 10.

For example, 25<100 and 18>7.

There are also symbols called less than or equal to.

x ≤ 15 means x is either less than 15 or equal to 15, but not greater than 15.

Similarly, y≥10 means y is either greater than 10 or equal to 10, but not less than 10.

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Percentage:- What percentage is 5 of 40?

The answer is 5/40 x 100% or 1/8 x 100%=12.5%.

In an examination,you score 360 out of a total of 500 marks.

What is your score in percentage?

It has to be calculated this way:- 360/500 x 100%

= 36/50 x 100% = 72%.

If 10% of the total purchase of 600 kilograms of materials are damaged, what is the quantity damaged?

10% of 600 kilograms = 10/100 x 600 kilograms = 60 kilograms.

If the price of the airfare from London to New York is $1500, and if the fare increases by 20%, what is the increased fare?

Original fare= $1500,Increase percentage= 20%

Therefore, Present fare = $1500 + 20/100($1500) = $1500 + $300 = $1800.

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Brackets are operated upon thus:-

(1) 2[(5+7)-(2X3)]

First,the innermost brackets are to be opened.

2[(5+7)-(2x3)] = 2[12 - 6] = 2[6] = 12.

(2) 3[(8x2)-(3+5)-2(7-3)] = 3[16-8-2(4)] = 3[16-8-8] = 3[0]=0.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,651

For further reading: Fractions and Percentages Index

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,588

Let's see, brackets. I'll try something with brackets.

Click here for video.

That didn't work, I don't know why.

Try this one, click here.

Sorry, I don't know why my video won't work, it's gone.

*Last edited by John E. Franklin (2006-03-20 15:35:33)*

**igloo** **myrtilles** **fourmis**

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**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,588

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**sweetangel786****Member**- Registered: 2006-03-18
- Posts: 20

thanks for all ur help, i've now learnt a lot on brakets and equations ...

practise makes people perfect, but nobody's perfect so why practise...

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