beginner

Number factorization

Master factors, multiples, and prime factorization. Learn rapid divisibility tests and calculate HCF and LCM to solve real-world grouping, sharing, and scheduling challenges with precision.

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Verified skills you'll gain

DEVELOPING

Analyzing Number Properties

DEVELOPING

Computing with Numbers

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Course 2

Divisibility Shortcuts

5 lessons

19 practices

You'll master quick divisibility tests for 2, 3, 4, 5, 6, 9, and 10 — learning to tell at a glance whether a number is divisible by any of these and understanding why each shortcut works in base ten.

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Course 3

Breaking Numbers Into Primes

4 lessons

16 practices

You'll learn to break any composite number into its prime factors using factor trees and repeated division, then express the result compactly and clearly using index notation.

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Course 4

Finding the Highest Common Factor

4 lessons

16 practices

You'll identify common factors and determine the Highest Common Factor of two or more numbers using factor lists and prime factorisation, then apply HCF reasoning to practical equal-sharing and grouping problems.

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Course 5

Finding the Lowest Common Multiple

5 lessons

21 practices

You'll find common multiples and the Lowest Common Multiple using listing and prime factorisation methods, apply LCM to repeating-cycle problems, and learn to choose confidently between HCF and LCM in any situation.

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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

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