Subject : Mathematics
Class :Primary 6
Topic : Open Sentences
Duration : 80 minutes
Period : Double Periods
Reference Book :
Progressive Mathematics for Primary Schools (Primary 4 – 6)
Lagos State Unified Schemes of Work for Primary Schools (Primary 4 -6 )
Online Resources
Instructional Material : Pictorial chart on Open Sentences
Learning Objectives : By the end of the lesson learners will be able to
i. Define Open sentences
ii. Solve problems on open sentences with different examples
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 Steps :
Step 1 : Revision of the previous lesson with the learners
Step 2 : Introduces the new topic by defining Open Sentences with various illustrations.
Step 3 : Explains the concept of like terms and algebraic simplifications
Step 4 : Solve different examples and gives the learners some tasks to do.
Evaluation :
Answer the following questions :
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