The Real Number System and Irrationality

General Skills

You will meet the numbers that refuse to be written as fractions. You will learn why their decimal expansions never terminate or repeat, recognize famous examples like π and e, and identify irrationals generated by square roots. Finally, you will learn to bound these numbers between integers to understand their place on the number line.

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5 lessons

16 practices

1 hour

Computing with Numbers

Course details

Introducing Irrational Numbers

Preview

Identifying Irrational Numbers

Decimal Behavior Practice

Explain Number Line Gaps

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Next Course: Estimating and Comparing Real Numbers

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From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11