Number Properties Puzzle – Challenge 12
This is a great logic puzzle and brain teaser for those who enjoy solving math and critical thinking problems. Let's see how you solve it! The solution is also provided.
Challenge:
How many digits are used to write the number \(20^{10}\)?
A- 10
B- 11
C- 12
D- 13
E- 14
The Absolute Best Book to challenge your Smart Student!
The correct answer is E.
\(20^{10} = (2 × 10)^{10} = 2^{10 }× 10^{10 }= 1024 × 10^{10}\)
1024 has four digits and \(10^{10 }\) has 11 digits. Why?
Therefore, \(20^{10 }\) has 15 digits.
Reza is an experienced Math instructor and a test-prep expert who has been tutoring students since 2008. He has helped many students raise their standardized test scores--and attend the colleges of their dreams. He works with students individually and in group settings, he tutors both live and online Math courses and the Math portion of standardized tests. He provides an individualized custom learning plan and the personalized attention that makes a difference in how students view math.
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