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
- 4th Grade North Carolina End-of-Grade Math Worksheets: FREE & Printable
- 9 Best Math Websites for Teachers and Students
- How to Evaluate Logarithms? (+FREE Worksheet!)
- Check Registers: Learn How to Develop the Ability to Organize Transactions
- How to Use Comparison test for Convergence
- How to Use Models to Divide Whole Numbers by Unit Fractions?
- 7th Grade STAAR Math FREE Sample Practice Questions
- How to Convert Between Polar and Rectangular Coordinates
- What Is a Passing Score on the CBEST Math?
- 7th Grade Georgia Milestones Assessment System Math Practice Test Questions
What people say about "Other Topics Puzzle – Challenge 95 - Effortless Math: We Help Students Learn to LOVE Mathematics"?
No one replied yet.