Binary to Denary Conversion
This key facts covers Binary to Denary Conversion within Binary & Hex for GCSE Computer Science. Revise Binary & Hex in 3.3 Data Representation for GCSE Computer Science with 16 exam-style questions and 22 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 15 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 15
Practice
16 questions
Recall
22 flashcards
Binary to Denary Conversion
Method: Add up place values where there's a 1
Example 1: Convert 11010110 to denary
Place values: 128 64 32 16 8 4 2 1 Binary: 1 1 0 1 0 1 1 0 Add where there's a 1: 128 + 64 + 16 + 4 + 2 = 214 (denary)
Example 2: Convert 10101 to denary
Place values: 16 8 4 2 1 Binary: 1 0 1 0 1 16 + 4 + 1 = 21 (denary)
Keep building this topic
Read this section alongside the surrounding pages in Binary & Hex. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Binary & Hex
Which of the following correctly describes the hexadecimal number system?
Explain why hexadecimal is used instead of binary when programmers write memory addresses and colour codes. Give three reasons.
Quick Recall Flashcards
16 questions on Binary & Hex — practise free
Instant marking, adaptive difficulty, and 22 spaced repetition flashcards. Free until your GCSEs.
Try PrepWise Free