# Arithmetic expressions

In this lesson, we will understand the rules of operator precedence when evaluating arithmetic expressions. We will be reminded of BIDMAS, before investigating code that uses various arithmetic expressions. This lesson will prepare us for the next lesson, where we will begin to use conditions in programming.

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.True or False: Pseudorandom number generation uses mathematical algorithms which are computer-generated and therefore highly predictable.

1/4

Q2.If you want to comment on your code over multiple lines, what syntax should you use?

2/4

Q3.When using the function randrange(1,5,2), what is the third value in the brackets used for?

3/4

Q4.When using the function randrange(1,5,2), what is the second value in the brackets used for?

4/4

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.True or False: Pseudorandom number generation uses mathematical algorithms which are computer-generated and therefore highly predictable.

1/4

Q2.If you want to comment on your code over multiple lines, what syntax should you use?

2/4

Q3.When using the function randrange(1,5,2), what is the third value in the brackets used for?

3/4

Q4.When using the function randrange(1,5,2), what is the second value in the brackets used for?

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.

Quiz:

# Arithmetic Expressions

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

Q1.What is the evaluation of this expression: 10 * 10 / 5

1/4

Q2.What is the evaluation of this expression: 5 - 2 + 6 / 2

2/4

Q3.If you were using integer division, what would be the evaluation of this expression: 14//3

3/4

Q4.If you were using modulo, what would be the evaluation of this expression: 14%3

4/4

Quiz:

# Arithmetic Expressions

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

Q1.What is the evaluation of this expression: 10 * 10 / 5

1/4

Q2.What is the evaluation of this expression: 5 - 2 + 6 / 2

2/4

Q3.If you were using integer division, what would be the evaluation of this expression: 14//3

3/4

Q4.If you were using modulo, what would be the evaluation of this expression: 14%3

4/4

# Lesson summary: Arithmetic expressions

## 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