Calculations with variables

In this lesson, we will look at writing calculations that include algebraic terms.

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.Answer the following: 18 x (5 - 3) + 7

1/5

Q2.Answer the following: 15 - 5 x 2

2/5

Q3.Answer the following: (18 - 7) x (2 + 5)

3/5

Q4.Which of the following statements matches the calculation 15 x (5 - 3)?

4/5

Q5.Which of the following statements matches the calculation 15 x (5 - 3) + 3?

5/5

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.Answer the following: 18 x (5 - 3) + 7

1/5

Q2.Answer the following: 15 - 5 x 2

2/5

Q3.Answer the following: (18 - 7) x (2 + 5)

3/5

Q4.Which of the following statements matches the calculation 15 x (5 - 3)?

4/5

Q5.Which of the following statements matches the calculation 15 x (5 - 3) + 3?

5/5

Video

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• Click "Close Video"
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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:

Calculations with variables

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

Q1.Which calculation matches the statement: I think of a number. I multiply my number by 2 then I subtract 5. (In the below calculations, m represents the originally thought number.)

1/5

Q2.Which calculation matches the statement: I think of a number. I subtract 5 from my number then I multiply by 2. (In the below calculations, m represents the originally thought number.)

2/5

Q3.Which calculation matches the statement: I think of a number. I subtract 5 from my number then I multiply by 2. I then subtract subtract 6 and finally multiply by 3.

3/5

Q4.Which of the following values of m gives an answer between 50-60 for the following calculation? 5 x m - 3

4/5

Q5.Which of the following values of m gives an answer between 30-35 for the following calculation? 5 x (m - 3)

5/5

Unit quizzes are being retired in August 2023

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

Calculations with variables

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

Q1.Which calculation matches the statement: I think of a number. I multiply my number by 2 then I subtract 5. (In the below calculations, m represents the originally thought number.)

1/5

Q2.Which calculation matches the statement: I think of a number. I subtract 5 from my number then I multiply by 2. (In the below calculations, m represents the originally thought number.)

2/5

Q3.Which calculation matches the statement: I think of a number. I subtract 5 from my number then I multiply by 2. I then subtract subtract 6 and finally multiply by 3.

3/5

Q4.Which of the following values of m gives an answer between 50-60 for the following calculation? 5 x m - 3

4/5

Q5.Which of the following values of m gives an answer between 30-35 for the following calculation? 5 x (m - 3)

5/5

Lesson summary: Calculations with variables

Time to move!

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For 5 mins...

Move around:
Walk

On the spot:
Dance