Number Properties Puzzle – Challenge 17

A FREE math puzzle for all ages! Sharing this fun math challenge with your kids is a good way to get them thinking mathematically.

Number Properties Puzzle – Challenge 17

Challenge:

How many numbers between 400 and 600 begins with digit 5 or ends with digit 5?

A- 20

B- 100

C- 110

D- 120

E- 140

The Absolute Best Book to challenge your Smart Student!

The correct answer is C.

Numbers between 500 and 599 begin with 5. So, there are 100 numbers that begin with 5.
Consider numbers that end with 5:
405, 415, 425, 435, …, 495
Also, numbers 505, 515, 525, …, 595, end with 5. But, we counted them before!
There are 20 numbers that end with 5. We counted 10 of them before. Therefore, there are 100 + 10 = 110 numbers that begin with digit 5 or end with digit 5.

Related to "Number Properties Puzzle – Challenge 17"

5 Essential Strategies in Teaching Math5 Essential Strategies in Teaching Math
Best Middle School Math SuppliesBest Middle School Math Supplies
10 Must-Have Elementary Classroom Math Supplies10 Must-Have Elementary Classroom Math Supplies
The Best School Supplies for Learning MathThe Best School Supplies for Learning Math
10 Must-Have Math Teacher Supplies10 Must-Have Math Teacher Supplies
Other Topics Puzzle – Challenge 100Other Topics Puzzle – Challenge 100
Other Topics Puzzle – Challenge 99Other Topics Puzzle – Challenge 99
Other Topics Puzzle – Challenge 98Other Topics Puzzle – Challenge 98
Other Topics Puzzle – Challenge 97Other Topics Puzzle – Challenge 97
Other Topics Puzzle – Challenge 96Other Topics Puzzle – Challenge 96

What people say about "Number Properties Puzzle - Challenge 17"?

No one replied yet.

Leave a Reply