A system of numerical notation that has 2 rather than 10 as a base.
In math, binary refers to the base-2 number system, which uses only two digits: 0 and 1. This is different from our regular number system (called base-10), which uses ten digits: 0 through 9.
Each place value in binary represents a power of 2, just like each place in base-10 represents a power of 10. This system is especially important in computer science because computers use only 0s and 1s to process information.
For example:
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The binary number 10 means 1 group of 2 and 0 ones, which is 2 in base-10.
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The binary number 101 means 1 group of 4, 0 groups of 2, and 1 group of 1, which equals 5.
When Do Students Learn About the Binary System?
Binary numbers are typically introduced as an extension topic or during lessons on number systems and computers.
Grades 6–8 – Exploring Number Systems
Students may learn about binary when exploring different bases or beginning to study computer science and digital logic.
Grades 9+ – Applying Binary in Computer Science and Math
Older students may study binary in more depth in algebra, coding, or specialized math courses.
