# APPLICATION OF ‘BODMAS’ RULE

LESSON PLANNING OF APPLICATION OF ‘BOD-MAS’ RULE

Subject Mathematics

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

(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   ‘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   ‘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