# Number systems: Operations in different bases

In this lesson, we will be looking at adding and subtracting numbers in different bases.

# 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:

# Operations in different bases

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

Q1.What is 15(base 6) written in base 10?

1/5

Q2.What is 21(base 5) written in base 10?

2/5

Q3.What is 31(base 5) + 22(base 3) in base 10?

3/5

Q4.What is 101(base 2) x 101(base 2) in base 10?

4/5

Q5.What is 10101(base 2) written in base 10?

5/5

Quiz:

# Operations in different bases

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

Q1.What is 15(base 6) written in base 10?

1/5

Q2.What is 21(base 5) written in base 10?

2/5

Q3.What is 31(base 5) + 22(base 3) in base 10?

3/5

Q4.What is 101(base 2) x 101(base 2) in base 10?

4/5

Q5.What is 10101(base 2) written in base 10?

5/5

# Lesson summary: Number systems: Operations in different bases

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Dance