# Expressing missing numbers algebraically

In this lesson, we will be finding the unknown values in algebraic expressions.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What would be the next term in this sequence? 4.5, 4.75, 5, 5.25, 5.5, 5.75

1/4

Q2.What is the term to term rule in this sequence? 9.2, 9.15, 9.1, 9.05

2/4

Q3.What would be the previous term in this sequence? -3, -1, 1, 3, 5

3/4

Q4.Look at the following sequence, which term below can not be part of that sequence? 56, 61, 66, 71, 76

4/4

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What would be the next term in this sequence? 4.5, 4.75, 5, 5.25, 5.5, 5.75

1/4

Q2.What is the term to term rule in this sequence? 9.2, 9.15, 9.1, 9.05

2/4

Q3.What would be the previous term in this sequence? -3, -1, 1, 3, 5

3/4

Q4.Look at the following sequence, which term below can not be part of that sequence? 56, 61, 66, 71, 76

4/4

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Expressing missing numbers algebraically

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.t + 7 = 20 What is the value of t?

1/5

Q2.If 5a = 35 What is the value of a?

2/5

Q3.How could we express the perimeter of the rectangle below?

3/5

Q4.How could we express the perimeter of the square below?

4/5

Q5.If 2f + 6= 20. What is the value of f?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Expressing missing numbers algebraically

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.t + 7 = 20 What is the value of t?

1/5

Q2.If 5a = 35 What is the value of a?

2/5

Q3.How could we express the perimeter of the rectangle below?

3/5

Q4.How could we express the perimeter of the square below?

4/5

Q5.If 2f + 6= 20. What is the value of f?

5/5

# Lesson summary: Expressing missing numbers algebraically

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Climb stairs

On the spot:
Chair yoga