Praxis Computer Science 5652 Practice Test 2026 - Complete Exam Guide

This question is about base-16 notation, where each digit represents a value from 0 to 15 using 0–9 for 0–9 and A–F for 10–15. One hex digit corresponds to four binary bits, making it a compact way to express binary data. For example, 2A means 2×16 plus 10, which equals 42 in decimal. This system is widely used in computing to map memory addresses and color codes because it cleanly pairs with the eight bits (or bytes) in data. The other options don’t fit: binary uses only 0 and 1, natural language isn’t a numeric base, and a rhombus is just a shape, not a numbering system.