Maths revision 2011

Volume of a square prism - H x L x W

Rules on Expanding brackets 

1.   Start with the first term and multiply everything in the 2^nd bracket

2.   Move on to the 2^nd term and multiply everything in the 2^nd bracket.

3.   Tidy up

Rules on factorise brackets:

1.   Open new set of brackets

2.   Look for the most common letter or number (that goes in to both number )

3.   Put the most common term outside the bracket

4.    Work out what goes inside the bracket

Factorising quadratic equations

1.   3 terms = 2 pairs of brackets

2.   How do I get the first term separate?

3.   Write down all the pairs of numbers tha multiply to give the third term

4.   Which pair added together make the 2^nd term

5.   Use this pair of numbers in the brackets.

Solve quadratic equations

1.   3terms = 2 pairs of brackets

2. How do I get the first term separate?

3. Write down all the pairs of numbers that multiply to give the third term

4. Try all the pairs of numbers by extending the brackets.

Mode- the mode of a set of a data is the value of which occurs most often.

The median- the median is the middle value when the data is arranged in order of size or the mean of two middle values

Mean- the mean of a set of data is the sum of the divided by the number of the value.

Locus - locus is a construction that follows a set of rules.

l.c.m - lowest common multiple  

h.c.f- highest common factor

Equilateral triangle - 3 sides are the same, 3 angles the same.

Right-angled triangle - 1 angle of 90oc degrees

Scalene- no side or angle the same

Isosceles - 2 sided the same, 2 angles the same

Diagonals bisect each other means when two diagonals lines cross each other. The angle in the middle is 90oc.