Other Topics Puzzle – Challenge 95
This great logic and critical thinking puzzle is based on logic and a bit of mathematics. Let's see who can solve it. The solution is also provided.
Challenge:
A book has 500 pages that is numbered from 1 to 500. How many numbers 2 is used for numbering all pages? (for page 222, three number 2 is used and for 201, one number 2 is used)
A- 100
B- 150
C- 200
D- 200
E- 220
The Absolute Best Book to Challenge Your Smart Student!
The correct answer is C.
To answer this question, we need to find the pattern. From 1 to 10, there is one number 2. From 10 to 19 has the same situation. From 20 to 29, there are 11 number 2. Why? (Consider 22)
With the same method, there is one number 2 in every ten numbers from 30 to 100. So, there are 20 number 2 from 1 to 100. There are 20 number 2 from 100 to 199.
From 200 to 300, there are 120 number 2. Why? (all numbers from 200 to 299 begin with 2)
From 300 to 500 there are 40 number 2. Therefore, there are 200 number 2 from number 1 to 500.The Best Books to Ace Algebra
Original price was: $29.99.$14.99Current price is: $14.99.Original price was: $29.99.$14.99Current price is: $14.99.Satisfied 1 StudentsOriginal price was: $24.99.$14.99Current price is: $14.99.Satisfied 92 StudentsOriginal price was: $24.99.$15.99Current price is: $15.99.Satisfied 125 Students
Related to This Article
More math articles
- 5th Grade NDSA Math Worksheets: FREE & Printable
- Top 10 5th Grade MEAP Math Practice Questions
- How to Identify Independent and Dependent Events?
- Full-Length 7th Grade IAR Math Practice Test-Answers and Explanations
- Full-Length ALEKS Math Practice Test-Answers and Explanations
- FREE 5th Grade ACT Aspire Math Practice Test
- How to Demystify Differences: A Guide to Subtracting Fractions with Unlike Denominators
- The Ultimate 7th Grade SBAC Math Course (+FREE Worksheets)
- Top 10 Tips to Create the CLEP College Algebra Study Plan
- 10 Most Common SSAT Upper-Level Math Questions
What people say about "Other Topics Puzzle – Challenge 95 - Effortless Math: We Help Students Learn to LOVE Mathematics"?
No one replied yet.