This introduction covers The Lego Addition Machine within Binary Arithmetic for GCSE Computer Science. Revise Binary Arithmetic in 3.3 Data Representation for GCSE Computer Science with 15 exam-style questions and 18 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 1 of 11 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
The Lego Addition Machine
Imagine building a calculator with Lego bricks, but you only have two colors: white (0) and black (1). Adding works the same as normal, but when two blacks meet, you get a white brick and "carry" a black to the next column. Want to multiply by 2? Easy - shift all bricks one space left! Want to divide by 2? Shift right! Want negative numbers? Paint the first brick red to mean "negative." This is exactly how computers do math - simple rules, billions of times per second!
Practice questions for Binary Arithmetic
In binary addition, what is the result of 1 + 1?
Explain the effect of a logical left shift and a logical right shift on the value of a binary number.