Exam-style question
Try this first
What is 101₂ × 11₂?.
- A.111₂
- B.1011₂
- C.1111₂
- D.10001₂
Model answer
What a good answer should say
- 1111₂
Explanation
Why this works
Multiply by each digit of 11₂: 101₂ × 1 = 101₂ and 101₂ × 1 shifted one place = 1010₂. Adding them gives 1111₂.
Common mistake
No common mistake is linked to this question yet.