Rules of addition,subtraction,multiplication,division of decimals and fractions

Rules of addition in decimals:
-line up the numbers and decimal point in the same line.For example:
2.33
1.55
0.5
-Add as usual from right to left, column by column.
-Place the decimal point in the answer in line with the other decimal points in the problem.

Rules of subtraction in decimals:
-Add zeros to the right side of the decimal with fewer decimal places so that each decimal has the same number of decimal places.
-a decimal point is placed in the difference such that it is directly below the decimal points in the numbers being subtracted

Rules of multiplication in decimals:
-Sometimes you need to write one or more zeros in the product before you can place the decimal point.
-You can write as many zeros as needed to the left of the product to place the decimal point.

Rules of division in decimals:
-If the divisor is not a whole number, move decimal point to right to make it a whole number and move decimal point in dividend the same number of places. 
- the decimal point in the answer is going directly to the dividend.

Rules of addition in fractions:
-If its the same denominator just add them ,but if although is the same denominator number and the addition of the numerators results are bigger than the denominator number need to simplify,but in some case not.
-If its not the same denominator and numerators number like two different numbers,added and at the end if the numerator addition result is bigger than the denominator number need to simplify,but in some case not.
-The addition of fractions are in the same line .For example:
2/3 + 4/3 =

2      4      6
-  +  -   =  -
3      3      6

Rules of subtraction in fractions: 
-To subtract fractions in some case that the denominators are the same so,just subtract.

Rules of multiplication in fractions :
-To multiply in fractions need to multiply those numbers in "x".
-If the answer of the numerator is bigger than the denominator need to change it into equivalent fractions.

Rules of division in fractions :
-In the case of dividing fractions need to re-write the fraction and the solve it.
For example:
2     2    2             1    2    1     2
-   ÷   -  =  -   multiply by -  =  _      _  =   _
5      1   5              2   5     2   10