Lesson Planning of Order of Operation: BODMAS Rule
Subject Mathematics
Grade 5^{th}
Students` Learning Outcomes
 Recognize BODMAS rule, using only parentheses ( ).
 Carry out combined operation using BODMAS rules.
Information for Teachers
B Bracket first
O Orders (i.e. Powers and Square Roots, etc)
D Division and
M Multiplication
A, Addition
S Subtraction
 Parentheses are used in math to show a part of math expression or equation that must be solved first, before any other calculation are done.
 In this lesson we will use only parenthesis ( ) as brackets.
 While teaching the lesson, also teacher consult with textbook at all steps wherein and whenever applicable.
Material / Resources
Writing board, chalk / marker, duster, textbook
Introduction
 Introduce to the students that Math operations tell whether to add, subtract, multiply or divide, and parenthesis tell which operation is to be done first.
Write 3 + 2 x 4 = ———— on board.
Write 20 as answer and ask who is agreeing?
Write 11 as answer and ask who agrees or disagree?
What are we to do – how can there be two answers in Math?
Explain the rule that we do multiplication first, addition second.
Ask can I make 3 + 2 x 4 = 20? (True)
 Tell the students that we follow the order like;

 1. B brackets first
 2. O Orders (Powers and square roots etc.)
 3. D Division
 4. M Multiplication
 5. A Addition
 6. S Subtraction

 Explain to the students that;
 Parenthesis ( ), can be used in math to show which part of the math expression should be done first, i.e. 8 – 5 + 1 and 8 – (5 + 1). The only difference between these two expressions is the parentheses.
 Operation given in parenthesis should be solved first.
Development
Activity 1
 Tell the students that we do operation on numbers. We add, subtract, multiply divide, but what to do if we have more than one operation to do at a time?
 How do we solve this: 3 – 5 ÷ (1 + 4) =?
 Let`s put BODMAS into practice.
 Repeat the acronym with whole class i.e. ( ), of, ÷, x +, .
 Write the following examples on the board and solve with the help of the students.
 Write first example on the board refers to the BODMAS rule and ask;
o Do we have any (parenthesis) [no]
o Do we have any order or powers? [no]
o What to do first addition or division? [division]
 Similarly discuss all the examples on board with students.
 Write on the board and explaining (8 – 4) + 5 x 8
 Parenthesis come first, so 8 – 4 = 4.
 Replace in the expression with 4, where (8 – 4) was, so: 4 + 5 x 8.
 This contains addition and multiplication. Multiplication comes before addition, so 5 x 8 = 40. Replace 40 with 5 x 8 in the sentence.
 That leaves 4 + 40. Finally, add 4 + 40 = 44. Solve few more same examples on the board with the help of the students.
 Divide class in groups of four and distribute mathematical sentences written on paper pieces. Each group will get the required result by applying brackets, e.g.
 Groups will swap their sheets after completing for the peer checking.
Activity 3
 Divide class into pairs
 Write numbers from 29 on paper slips fold them and put them in a box.
 Ask each pair to take one paper slip.
 Give them instruction that they have to use the number and operations to get the answer equal to 1.
 For example if they have got 4, they have to use 4 four times and get answer equal to 1 like ;( 4 ÷ 4) + 4 – 4 = 1
 Similarly find an expression to make the number equal to 0.
 Time the activity.
 If students don`t get the answers. Solve on the board with the help of the students.
 This will give them extensive practice with application of BODMAS.
Sum up / Conclusion
 Parentheses are used to show what should be done first in arithmetic expression.
 Parenthesis () are the most frequently used group symbols.
Assessment
 Give the following questions to solve individually.
Follow up
Make 5 different arithmetical expressions using all operations and parenthesis, giving answer equal to 5 for each expression.