Number Properties Puzzle – Challenge 1
This is a great math challenge for those who love mathematics and critical thinking challenges. Let's challenge your brain!
Challenge:
What is the average (arithmetic mean) of all the multiples of ten from 110 to 990 inclusive?
A- 480
B- 500
C- 550
D- 590
The Absolute Best Book to Challenge Your Smart Student!
The correct answer is C.
To answer this question, you can add all the multiples of ten from 110 to 990 and then divide the answer by the number of numbers. As you can imagine, this method takes a lot of time. Another way to solve this problem is by finding the average of the first number 110 and last number 990 (110 + 990 = 1100 ÷ 2 = 550). Do the same thing for the next two numbers 120 and 980. Continue the process for other pair of numbers; 130-970, 140-960, etc. The average of all pairs is 550. Therefore, the average (arithmetic mean) of all the multiples of ten from 110 to 990 inclusive is 550.
The Absolute Best Books to Challenge Students!
Related to This Article
More math articles
- 5th Grade PACE Math Worksheets: FREE & Printable
- How to Draw Geometric Shapes with given condition?
- What Are The Optimization Problems: Beginners Complete Guide
- How to Find Addition and Subtraction of Vectors?
- How to Find Measures of Variability? (+FREE Worksheet!)
- How to Solve a Quadratic Equation by Graphing?
- 8th Grade MCAS Math Practice Test Questions
- ASTB Math Formulas
- How to Identify Expressions and Equations?
- FREE 5th Grade PSSA Math Practice Test
What people say about "Number Properties Puzzle – Challenge 1 - Effortless Math: We Help Students Learn to LOVE Mathematics"?
No one replied yet.