# Maths Notes

It includes how to do order of operations, integers, fractions, decimals, percentages and examples.......i hope it's helpful.......it's mostly for 7, 8, 9 graders.

- Created by: Maya
- Created on: 22-04-12 12:52

First 256 words of the document:

Maths Notes

Number Skills

The order of operations

1. All expressions in grouping symbols are evaluated first, beginning with the

innermost grouping symbols then, all multiplication and division are evaluated,

working from left to right and finally, any addition and subtraction, working

from left to right.

Integers

The rules for using integers are:

Rule -When adding integers with the same sign, keep the sign and add; -3 + -2 = -5.

Rule 2 - When adding integers with different signs, find the difference and use the sign

of the number further from zero; 3 + 4 = 1.

Rule 3 - When subtracting integers, add the opposite; 5 - -7 = 12.

Rule 4 - When multiplying integers, the following rules are obeyed.

(a) Positive × Positive = Positive

(b) Positive × Negative = Negative

(c) Negative × Positive = Negative

(d) Negative × Negative = Positive

Rule 5 - When dividing integers, use the same rules as for multiplication.

Decimals

1. To order decimals, write each with the same number of decimal places and

compare.

2. To write terminating decimals as fractions, make the denominator an

appropriate power of 10 and simplify where possible. The number of zeros in

the denominator should be the same as the number of digits after the decimal

point.

3. To convert a decimal to a percentage, multiply by 100 and include the

percentage sign.

Fractions

1. To write fractions in simplest form, divide the numerator and the denominator

by the highest common factor (HCF) of both.

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