Open Sentences
Subject : Mathematics
Class :Primary 6
Topic : Open Sentences
Term :Third Term
Week :Week 2
Previous Knowledge : Revision
Instructional Materials : Mathematics textbook, online materials, Wall charts
Behavioural Objectives : At the end of the lesson, pupils should be able to
Solve simple questions on open sentences
They should also be able to invert the addition ➕ sign to subtraction ➖ sign when moving figures over the equal to signs
They should also be able to change the division ➗ sign to multiplication ✖ sign when moving figures over the equal to sign
Content :
Open sentences are used in mathematics to hide the values of some certain numbers so that we can work out the values of such numbers
The unknown values in open sentences may be represented by any letters of the alphabet or shapes
If we want to determine the value of any unknown figures in open sentences, then we either do addition ➕, subtraction ➖. multiplication ✖, or division ➗ of numbers as the case may be to.
Samples :
Question 1. Given that b + 6 = 10
What is the value of b
Solution
b = 10.- 6
b=4
Ans = 4
Question 2. 4x= 24, what is the value of x
Solution
Given that 4x=24
X=24/4
X=6
Ans =6
Question 3. If 40 notes are to be shared among 5 pupils, how many notebooks will be given to a pupil
Solution
5P= 40
P= 40 /5
P=8
Ans = 8 notes will be given to each pupil
Question 4
Given that 4x+2 =6+2x
What is the value of x
Solution
Collect like Term
4x-2x=6-2
2x=4
Divide both sides by 2
2x/2 = 4/2
X = 2
Presentation
Step 1
The teacher revises the previous topics
Step 2
The teacher introduces the new topic
Step 3
The teacher allows the pupils to give their own contributions and he allows them to feel free
Evaluation
Class work
Question 1.
b+ 20 = 16
What is the value of b
Question 2.
If 60 apples are to be shared among 6 boys, how many apples will each boy collect
Question 3
4q + 10q = 350
What is the value of q
Question 4
9y+24=4y – 16
What is the value of y
Conclusion :
The class teacher does the necessary corrections and he goes round to mark