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How many digits will the cube of a 1-digit number have AT MOST?
A1
B2
C3
D6
Answer & Solution
Correct answer: C. 3
The largest 1-digit number is 9, and 9³ = 729 — a 3-digit number. Cubes of 1-digit numbers can have 1 digit (1³ = 1), 2 digits (e.g. 2³ = 8 still 1; 3³ = 27 has 2; up to 4³ = 64), or 3 digits (5³ = 125 onward). So at most 3 digits.
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