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
- Top 10 Praxis Core Math Practice Questions
- 7 Best Headphones for Online Lessons
- A Deep Dive Into the World Derivative of Polar Coordinates
- Algebra Puzzle – Challenge 32
- Pre-Algebra Practice Test Questions
- How to Write a Formula for a Recursive Sequence
- 5 Bеѕt саlсulаtоrѕ fоr ѕtаtiѕtiсѕ
- How to Use Number Lines for Multiplication by a Negative Integer?
- How to Add Mixed Numbers? (+FREE Worksheet!)
- Top 10 Tips to Create an ACCUPLACER Math Study Plan
What people say about "Number Properties Puzzle – Challenge 1 - Effortless Math: We Help Students Learn to LOVE Mathematics"?
No one replied yet.