## BASIC MATH RULES

The webpage, basic math rules is going to provide you some preliminary concepts in maths. Some students will have the feeling that the subject math is very though for me. Actually it is not like that. If some one will guide them from the basic level, they will feel better.

## How to add two numbers with different signs?

Rules of adding integers with different signs

 Sign of first and second number What do we have to do? + + - - Add both numbers and put "big number" sign for the answer. + -(or) - + Subtract small number from large number and put "large number" sign for the answer.

Easy way of understanding this concept:

This flowchart will explain you how to handle two numbers with different symbol.

The above rule is applicable for simplifying any two or more integers,fractions and decimals.

Note: Always we have to put big number symbol for answer.

Let us see example problems on adding integers of "basic math rules"

## Example problems on adding integers

Problem 1 :

Simplify  -5 + 3

Solution :

What we have to check?

Consider the symbol of two numbers. The symbol of first number is negative and the symbol of second number is positive.

Do we have to add or subtract?

Since the symbols of both numbers are different we have to subtract small number from large number.Here small number is 3 and large number is 5. By subtraction we will get 2.

What symbol we have to put for answer?

We have to put symbol of big number. Here the big number is 5 and we have negative symbol for this.

-5 + 3 = -2 is the answer.

We have explained this concept in the below flowchart.

Problem 2 :

Simplify  -15 + 13 - 27 - 43 + 77

Solution :

First we have to write the numbers which are having same symbol.Here the numbers 15,27 and 43 are having same symbol

= - 15 - 27 - 43 + 13 + 77

For more examples please visit the page "adding integers with different signs"

Let us see the next concept of "basic math rules"

## Exponents

What is exponent?

The exponent of a number says how many times to use the number in a multiplication.

for example 5³ = 5 x 5 x 5

In words 5³ could be called as 5 to the power 3 or 5 cube.

## Basic Exponent Rules

 Rule 1 :

When we have to simplify two or more the terms which are multiplying with same base,then we have to put the same base and add the powers.

 Rule 2 :

Whenever we have two terms which are diving with the same base,we have to put only one base and we have to subtract the powers.

 Rule 3 :

Whenever we have power to the power,we have to multiply both powers.

 Rule 4 :

Anything to the power zero is 1.

 Rule 5 :

If we have same power for 2 or more terms which are multiplying or dividing,we have to apply the powers for every terms.

Note:

This rule is not applicable when two are more terms which are adding and subtracting.

For example (x + y) ^m = (x^m + y^m) is not correct

## How to move an exponents or powers to the other side ?

 If the power goes from one side of equal sign to the other side,it will flip.that is x = 4²

Let us see example problems on exponents of "basic math rules"

## Example problems on exponents

Problem 1 :

Find the value of (8/27)^(-1/3) (32/243)^(-1/5)

Solution :

For more examples please visit the page "Exponent rules"

Let us see the next concept of "basic math rules"

## How to convert fraction into decimal?

To convert the given fraction into decimal, first we have to check whether the denominator of the mixed fraction is convertible to 10 or 100 using multiplication.

If it is convertible to 10 or 100 using multiplication, we can convert the given mixed number into decimal as explained below.

For more examples please visit the page "Fraction into decimal"

## Adding fractions with different denominators

Here, we explain two methods to add two fraction with different denominators.

• Cross multiplication method
• L.C.M method

If the denominators of the fractions are co-prime or relatively prime, we have to apply this method.

For example, let us consider the two fractions 1/8,  1/3.

In the above two fractions, denominators are 8 and 3.

For 8 and 3, there is no common divisor other than 1. So 8 and 3 are co-prime.

Here we have to apply cross-multiplication method to add the two fractions 1/8 and 1/3 as given below.

L.C.M method

If the denominators of the fractions are not co-prime (there is a common divisor other than 1), we have to apply this method.

Let us see the next concept of "basic math rules"

A symbol used to indicate square of any number is called radical. The number which is under the root is called radicand.

√3 is called square root of 3.

How to simplify a radical number?

To simplify a number which is in radical sign we need to follow the below steps

• Split the number as much as possible
• If two same numbers are multiplying in the square root sign,we need to take only one number from the radical sign.
• In case we have any number in front of radical sign already,we have multiply the number taken out by the number in front of radical sign already.
• If we have cube root ∛ or fourth root ∜ like that we have to take one term from 3 same terms or four same terms respectively.

Let us see example problems on radicals of "basic math rules"

Problem 1:

√27 + √75 + √108 - √48

Solution:

= √27 + √75 + √108 - √48

First we have to split the given numbers inside the radical as much as possible.

=  √(3 x 3 x 3) + √(3 x 5 x 5) +

√(3 x 3 x 2 x 2 x 2) - √(2 x 2 x 2 x 2 x 2)

=  3 √3 + 5 √3 + 2 x 3 √2 - 2 x 2 √2

=  3 √3 + 5 √3 + 6 √2 - 4 √2

= (3 + 5) √3 + (6-4) √2

= 8 √3 + 2 √2

Let us see the next concept of "basic math rules"

## Simplifying fractions

Simplifying fractions means reducing the numerator and denominator as much as possible same numbers.

We have to divide the numerator and denominator by the same number at a time.

Step 1:

Write the numerator and denominator in single line and draw the L shape.

Step 2:

Divide them by common factors as much as possible. If two numbers are not divisible by any common number then we have to leave it as it is.

Step 3:

The pair of numbers which is at the last step is the simplified form of the given original fraction.

Problem 1:

Simplify 42/60 in simplest form

Solution:

Step 1:

Write the two numbers on one line

Step 2:

Draw the L shape

Step 3 :

Divide out common prime numbers starting from the smallest

For more examples please visit the page "Simplifying fractions"

Let us see the next concept of "basic math rules"

## Converting percent into fraction

Step 1 :

Write the given percentage as fraction by taking 100 as denominator.

Step 2 :

If it is needed, the fraction can be simplified further. That's it.

In the process of converting percentage into fraction, we may have the following situations.

% (<100) ----> Proper fraction

% (>100) ----> Improper fraction / Mixed fraction

(multiple of 100) ----> Integer

Example  :

Convert the percentage given below into a proper fraction

24%

Solution :

24%  =  24/100  =  6/25

Hence the proper fraction equal to the given percentage is 6/25

For more examples please visit the page "Converting percent into fraction"

Let us see the next concept of "basic math rules"

## Place value and face value

Place value :

Place value of a digit in a number is the digit multiplied by thousand or hundred or whatever place it is situated.

For example,

In 25486, the place value of 5 is = 5x1000 = 5000.

Here, to get the place value of 5, we multiply 5 by 1000. Because 5 is at thousands place.

Face value :

Face value of a digit in a number is the digit itself.

More clearly, face value of a digit always remains same irrespective of the position where it is located.

For example,

In 25486, the face value of 5 is = 5.

To know more about place value and face value please visit the page "Place value and Face value

Let us see the next concept of "basic math rules"

## Solving equations

A one-step equation is as straightforward as it sounds. We just have to perform one step in order to solve the equation.

We have to isolate the variable which comes in the equation.

Example 1 :

Solve :  5 + x  =  3

Solution :

Here 5 is added to the variable "x". To get rid of 5, we have to take "negative 5" on both sides and solve the equation as explained below.

For more example please visit the page "Solving one step equation"

You can also visit our following web pages on different stuff in math.

WORD PROBLEMS

Word problems on simple equations

Word problems on linear equations

Algebra word problems

Word problems on trains

Area and perimeter word problems

Word problems on direct variation and inverse variation

Word problems on unit price

Word problems on unit rate

Word problems on comparing rates

Converting customary units word problems

Converting metric units word problems

Word problems on simple interest

Word problems on compound interest

Word problems on types of angles

Complementary and supplementary angles word problems

Double facts word problems

Trigonometry word problems

Percentage word problems

Profit and loss word problems

Markup and markdown word problems

Decimal word problems

Word problems on fractions

Word problems on mixed fractrions

One step equation word problems

Linear inequalities word problems

Ratio and proportion word problems

Time and work word problems

Word problems on sets and venn diagrams

Word problems on ages

Pythagorean theorem word problems

Percent of a number word problems

Word problems on constant speed

Word problems on average speed

Word problems on sum of the angles of a triangle is 180 degree

OTHER TOPICS

Profit and loss shortcuts

Percentage shortcuts

Times table shortcuts

Time, speed and distance shortcuts

Ratio and proportion shortcuts

Domain and range of rational functions

Domain and range of rational functions with holes

Graphing rational functions

Graphing rational functions with holes

Converting repeating decimals in to fractions

Decimal representation of rational numbers

Finding square root using long division

L.C.M method to solve time and work problems

Translating the word problems in to algebraic expressions

Remainder when 2 power 256 is divided by 17

Remainder when 17 power 23 is divided by 16

Sum of all three digit numbers divisible by 6

Sum of all three digit numbers divisible by 7

Sum of all three digit numbers divisible by 8

Sum of all three digit numbers formed using 1, 3, 4

Sum of all three four digit numbers formed with non zero digits

Sum of all three four digit numbers formed using 0, 1, 2, 3

Sum of all three four digit numbers formed using 1, 2, 5, 6