APPLICATION OF ‘BODMAS’ RULE

 

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

 

 

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