# Ch 1: CAHSEE - Number Theory & Basic Arithmetic: Help and Review

The Number Theory & Basic Arithmetic chapter of this CAHSEE Math Help and Review course is the simplest way to master number theory and basic arithmetic. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of number theory and basic arithmetic.

## Who's it for?

Anyone who needs help learning or mastering CAHSEE math material will benefit from taking this course. There is no faster or easier way to prepare for the CAHSEE math exam. Among those who would benefit are:

• Students who have fallen behind in understanding basic arithmetic operations or the properties of real and rational numbers
• Students who struggle with learning disabilities or learning differences, including autism and ADHD
• Students who prefer multiple ways of learning math (visual or auditory)
• Students who have missed class time and need to catch up
• Students who need an efficient way to learn about number theory and basic arithmetic
• Students who struggle to understand their teachers
• Students who attend schools without extra math learning resources

## How it works:

• Find videos in our course that cover what you need to learn or review.
• Press play and watch the video lesson.
• Refer to the video transcripts to reinforce your learning.
• Test your understanding of each lesson with short quizzes.
• Verify you're ready by completing the Number Theory & Basic Arithmetic chapter exam.

## Why it works:

• Study Efficiently: Skip what you know, review what you don't.
• Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
• Be Ready on Test Day: Use the Number Theory & Basic Arithmetic chapter exam to be prepared.
• Get Extra Support: Ask our subject-matter experts any number theory or basic arithmetic question. They're here to help!
• Study With Flexibility: Watch videos on any web-ready device.

## Students will review:

This chapter helps students review the concepts in a number theory and basic arithmetic unit of a standard high school math course. Topics covered include:

• Types of numbers
• Graphs of rational numbers
• Notation for rational numbers
• The order of real numbers
• The absolute value of a real number
• Components of a number line
• Binary and non-binary operations
• Arithmetic calculations with signed numbers
• The commutative property
• The associative property
• The multiplication property of zero
• The greatest common factor
• The least common multiple
• Parentheses in math
• Algebra vocabulary terms
• The order of operations

Final Exam
Chapter Exam

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