Yr 9 Unit4 Week 1 - Lesson 4

• Mathematics
• Lower Secondary (Key Stage 3)

Yr 9 Unit4 - Lesson 4

Explain what we mean by collecting like terms i.e. a + a + b + b +b

Simplify a + a + b + b + b

1. 2a + 3b
2. 3b + 2a
3. 2a + b
4. a + 3b

Simplify 2a + a + b + b -3 b

1. 3a + 5b
2. 2a - 3b
3. 3a - b
4. 2a - 3b

Simplify -2a + a + b + -b -3 b

1. 3a + 5b
2. a + 5b
3. a - 4b
4. -a - 3b

Describe what is meant by substitution in a mathematical expression

If a = 3 and b = 7 calculate 2a + b

1. 10
2. 6
3. 13
4. 7

If a = 3 and b = 7 calculate 2a + 3b

1. 23
2. 6
3. 21
4. 27

If a = 3 and b = 7 calculate 2a - 3b

1. -15
2. 15
3. -5
4. 5

If a = -3 and b = -7 calculate 2a + 3b

1. -27
2. 27
3. -15
4. 15

DO NOW

TITLE - Unit 4 Week 1 - Lesson 4 - DO NOW

INSTRUCTIONS - Copy the top two questions into your exercise book and then answer them.

QUESTIONS - Top two

Describe what you can see in the diagram above

Describe the name of the blue shape below

1. Heptagon
2. Hexagon
3. Henagon
4. Hebagon

Write down the equation for the following diagram

1. h + s
2. h + s = 25
3. 4h = 25
4. 4h + s = 25

Select the correct sentences which describe the image above.

1. There are 2 equations.
2. There is a total of 5 heptagons.
3. There are 8 squares.
4. The total of the 2 equations is 11.

Select the correct sentences which describe the image above.

1. 2h + 3s = 6
2. 3s + 2h = 6
3. 6 = 3s + 2h
4. 2h + 3s = 5

Select the correct answer for the sum of the 2 equations.

1. 5h + 3s = 11
2. 3s + 8h = 11
3. 5h + 8s = 5
4. 5h + 8h = 11

Whiteboard

7h + 6s = 

Whiteboard

7h + 6s = 

Whiteboard

7h + 6s = 

Whiteboard

7h + 6s = 25 + 6

Whiteboard

7h + 6s = 25 + 6

= 31

Whiteboard

8h + 7s 

Whiteboard

3h + 7s 

Whiteboard

2h + s 

NEW LEARNING

TITLE - Unit 4 Week 1 - Lesson 4 - NEW LEARNING

INSTRUCTIONS - Copy the selected notes into your exercise book.

If 4x + y = 19 and x + 2y = 10, what is the value of 5x + 3y?

1. 15
2. 22
3. 29
4. Cannot tell

If 4x + y = 19 and x + 2y = 10, what is the value of 3x - y?

1. 9
2. 26
3. 16
4. Cannot tell

If a + 5b = 20 and 3a - 8b = -5, what is the value of 4a - 3b?

1. -25
2. -15
3. 15
4. 25

INDEPENDENT STUDY

TITLE - Unit 4 Week 1 - Lesson 4 - INDEPENDENT STUDY

INSTRUCTIONS - Copy the selected questions into your exercise book and then answer them.

QUESTIONS - 1 and 2