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Decimal to Hex — Learn

Learn decimal-to-hex the way it works — test each place value from the left, how many times does it fit, and subtract.

Complete this interactive to capture a CTF flag worth 1 point.

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About this interactive

What you're seeing: a guided walkthrough that converts a decimal value to hex by testing each place value, largest first. Why it matters: this is the exact method behind decimal-to-hex conversion — walk the columns from the left, ask "how many times does this place value fit in what's left?", set the digit, and subtract. How to use it: step through it in Guided mode, then switch to Solo to read the value and enter the hex yourself.

What you'll learn

Aligned to

CompTIA Tech+
1.2 Identify notational systems.

Key terms

Hexadecimal
Hex
A base-16 number system using digits 0–9 and letters A–F; each hex digit maps to exactly 4 bits, making it a compact shorthand for representing binary data.
Decimal
The base-10 number system using digits 0–9; the standard system used in everyday counting and arithmetic, and the most common format for presenting numeric output to humans.
Byte
A group of 8 bits; the standard unit for representing a single character or small value in computing, and the building block for larger storage measurements such as kilobytes and gigabytes.
Place Value
The weight assigned to a digit based on its position within a number; in binary, each position represents a successive power of 2 (1, 2, 4, 8, …), making position the key to decoding binary values.

Topics

Hexadecimal Decimal Number Systems Data Representation

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