AP CSP Day 31 Hexadecimal Number Systems
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Big Idea 2
Day 31 Practice
Focus: Hexadecimal Number Systems
Practice Question
What is the decimal (base 10) equivalent of the hexadecimal number 2F?
Why This Answer?
Hexadecimal uses base 16. 2F = (2 × 16¹) + (F × 16⁰) = 32 + 15 = 47. Remember F in hex equals 15 in decimal.
Why Not the Others?
A) This would be hex 1D.
B) This would be hex 25.
D) This would be hex 34.
Common Mistake
Watch Out!
Forgetting that hex digits A-F represent 10-15 in decimal. F = 15, not 5.
AP Exam Tip
Memorize: Hex A=10, B=11, C=12, D=13, E=14, F=15. Calculate using place values.