Question 1

How do I convert decimal to hexadecimal manually?

Accepted Answer

Divide by 16 repeatedly, noting remainders. Remainders 10–15 become A–F. Example: 255 ÷ 16 = 15 R15 → 15 ÷ 16 = 0 R15. Reading bottom-up: FF. Verify: 15×16 + 15 = 255. So 255 decimal = FF hex.

Question 2

Why are letters A–F used in hexadecimal?

Accepted Answer

Hexadecimal is base-16 and needs 16 symbols. Digits 0–9 cover 0–9; letters A–F represent values 10–15. This convention has been standard since the early days of computing and is now universal across all programming languages and tools.

Question 3

What are common uses of hexadecimal in computing?

Accepted Answer

Memory addresses (0x7F00FF), color codes (#FF5733 in CSS/HTML), MAC addresses (AA:BB:CC:DD:EE:FF), cryptographic hashes (SHA-256 outputs), raw binary data representation, HTML character entities, and CPU instruction codes.

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