LESSON PLANNING OF APPLICATION OF ‘BOD-MAS’ RULE
Subject Mathematics
Grade 5th
Students` Learning Outcomes
- Simplify expressions involving fractions using ‘BOD-MAS’ RULE.
Information for Teachers
- For simplifying an expression, we must perform these operations strictly in the following order:
(1) Brackets
(2) Of
(3) Division
(4) Multiplication
(5) Addition
(6) Subtraction.
- To remember the order, remember the word ‘BOD-MAS’ which is formed by the first letters of the operations in an order.
- Explain the ‘BOD-MAS’ terms:
o ‘B’ stands for brackets. (introduce and explain types of brackets)
o ‘O’ Stands for Order (powers, square, roots etc.)
o ‘D’ Stands for Division.
o ‘M’ Stands for multiplication
o ‘A’ stands for addition.
o ‘S’ stands for subtraction
- Strictly in that order, so do the operations in that order in simplifying fractions.
- While teaching the lesson, the teacher should also consult with textbook at all steps where and when applicable.
Material / Resources
Blank sheets for the group activity, chalk / marker, writing board, textbook
Introduction
- Ask students to calculate the following and write down their answers on their notebooks;
o 2 + 6 x 3
o (4 x 2) + (5 x 3)
o 10 – 3 x 5
- Ask: How did they decide to do multiplication, subtraction or addition first? [Observe what percentage of the class remembers BOD-MAS]
- Appreciate the students with right answers.
- Invite them to solve the question on the board and explain it to others as well.
- Discuss the answers and tell that today we will apply BOD-MAS on fractions.
Development
Activity 1
- Explain by writing an example on the board as such; (5 / 6 – 1 / 2) + 4 / 5 ÷ 3 / 5
- Ask students, which part will we do first? (5 / 6 – 1 /2)
- First step (Open the brackets)
- Say to students, we get 1 / 3 + 4 / 5 ÷ 3 / 5
- Ask which operations will we do fist? (÷)
- Solve
- Say to students, now we will get:
- We have done all the four operations but according to BOD-MAS rule. Let`s do another example but you are going to help me.
Activity 2
- Write another example on board and solve it through questioning with students as you did in previous example:
- First solve 3 / 12 x 2 / 3 = 1 / 6 and put its value:
- Now, solve (7 / 8 ÷ 1 /6) = 25 / 24 and put its value:
- Now solve.
- Now solve after putting above values .
After Putting above value as;
Sum up / Conclusion
- Explain “BOD-MAS” rule.
- Introduce all types of brackets (Take help from textbook) follow “BODMAS”
o ‘B’ stands for brackets. (introduce and explain types of brackets)
o ‘O’ Stands for Order (powers, square, roots etc.)
o ‘D’ Stands for Division.
o ‘M’ Stands for multiplication
o ‘A’ stands for addition.
o ‘S’ stands for subtraction
Assessment
- Write question on board and say to solve on their copies.
- Allocate time so everybody is worried about their work.
- Collect notebooks for assessment
Follow up
- Questions from the text book
- Simplify
