Substituting

ALGEBRA

Lesson Objectives:

-To evaluate algebraic expressions.

-To apply the order of operations in substituting values.

SUCCESS CRITERIA I can....

• Use letters to express basic arithmetic processes algebraically

• Apply the order of operations among integers

• Evaluate algebraic expressions by substituting positive numbers into the formula    

• Evaluate algebraic expressions by substituting negative numbers into the formula    

• Apply the concept in problem solving.

STARTER.....

Introduction

  The child’s dose for Dr Medicine’s Cough mixture is worked out using the formula

 $C=\frac{a}{a+10}\times d$  , where C is child’s dose, a is the age of the child and d is the normal adult dose. If the normal adult dose is 24 ml. What is the child’s dose for a child aged 10?

 The speed of the Dubai tram is 90km/hr. The distance covered by the tram is 180 km. calculate the time taken.

MUST TASK

Evaluate the following expressions 

If x = 2 , y = 4 and z = -1

a) x + y +z

b) 2 x + 3 y

C) x ² + Y ²

d) 3 (x + y) + z 

MINI PLENARY

Spot the mistake

GROUP ACTIVITY

Decode the message by substituting the given values.

Complete the activity through discussion in the respective group channels.

Now Your Turn.........

  The child’s dose for Dr Medicine’s Cough mixture is worked out using the formula

 $C=\frac{a}{a+10}\times d$  , where C is child’s dose, a is the age of the child and d is the normal adult dose. If the normal adult dose is 24 ml. What is the child’s dose for a child aged 10?

Multiple Choice

$$n^2$$   can be written as,

• $$n+n$$  

• $$n\times n$$  

• $$2n$$  

Multiple Choice

If p=2 and q= -5, then pq=

• 10

• -10

• 7

• -7

Multiple Choice

If a = 4 and b = 6, what is the value of 3a + 5b?

• 40

• 42

• 44

• 46

Multiple Choice

If y=7,find the value of 2(y+4)

• 11

• 22

• 20

Multiple Choice

If x=5,find the value of 7x-1

• 34

• 36

• 35

Poll

Success criteria. I can

Use letters to express basic arithmetic processes algebraically

Apply the order of operations in integers

• COMPLETELY

• PARTIALLY

• NEED IMPROVEMENT

Poll

Success criteria. I can

Evaluate algebraic expressions by substituting positive numbers into the formula

• COMPLETELY

• PARTIALLY

• NEED IMPROVEMENT

Poll

Success criteria. I can

Evaluate algebraic expressions by substituting negative numbers into the formula

• COMPLETELY

• PARTIALLY

• NEED IMPROVEMENT

Poll

Success Criteria

Apply the concept in problem solving

• COMPLETELY

• PARTIALLY

• NEED IMPROVEMENT

HOME LEARNING

Textbook Page: 177

Q’s 3,4,5 and 6

Upload the home learning tasks on Teams class note book.