# EVALUATE THE EXPRESSION

"Evaluate the expression" is one of the important basic stuff of algebra in math.

Before going to see examples of evaluating expressions first let us learn the rule called "BODMAS".

## What is BODMAS rule ?

The rule or order that we use to simplify expressions in math is called "BODMAS" rule.

Very simply way to remember  BODMAS rule!

-----> Brackets first (Parentheses)

-----> Of (orders :Powers and radicals)

D -----> Division

-----> Multiplication

-----> Subtraction

Important notes :

1. In a particular simplification, if you have both multiplication and division, do the operations one by one in the order from left to right.

2. Division does not always come before multiplication. We have to do one by one in the order from left to right.

3. In a particular simplification, if you have both addition and subtraction, do the operations one by one in the order from left to right.

Examples :

12 ÷ 3 x 5  =  4 x 5  =  20

13 - 5 + 9   =  8 + 9  =  17

In the above simplification, we have both division and multiplication. From left to right, we have division first and multiplication next. So we do division first and multiplication next.

Example 1 :

Evaluate the expression  5 + 2 - 3

Solution :

In the above problem we have two signs addition and subtraction.

Step 1 :

First add the numbers which are in wither sides of positive sign.

=  5 + 2 - 3

Step 2 :

Now, we have to subtract 3 from 7.

=  7 - 3

=  4

Example 2 :

Evaluate the expression 6(6 ÷ 2) x 9

Solution :

According to the rule BODMAS, first we have to consider the numbers which are in bracket or parenthesis.

=  6(6 ÷ 2) x 9

=  6 (3) x 9

Now, we have three numbers which are multiplying. So multiply those numbers

=  18 x 9 ==> 162

Example 3 :

Evaluate 6(6) ÷ (2 x 9)

Solution :

According to the rule BODMAS, first we have to consider the numbers which are in bracket.

=  6(6)  ÷  18

=  (6 x  6)/18

=  2

Now, we have three numbers which are multiplying. So multiply those numbers

=  18 x 9 ==> 162

Example 4 :

Evaluate  100 ÷ (16 + 9) x 6

Solution :

According to the rule BODMAS, first we have to consider the numbers which are in bracket.

=  100 ÷ (16 + 9) x 6

=  100 ÷ 25 x 6

=  4 x 6 ==> 24

Example 5 :

Evaluate the expression (2 x 11 + 1) - (3 x 6 + 5)

Solution :

According to the rule BODMAS, first we have to consider the numbers which are in bracket.

=  (2 x 11 + 1) - (3 x 6 + 5)

Inside the bracket, we have two signs multiplication and addition. First, we have to perform multiplication then we have to do addition.

=  23 - 23 ==> 0

We hope that the students would have understood the stuff given on "Writing and evaluating expressions"

If you need any other stuff, please use our google custom search here.

WORD PROBLEMS

HCF and LCM  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