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 begin with digit 5 or end with digit 5?

A- 20

B- 100

C- 110

D- 120

E- 140

The Absolute Best Book to Challenge Your Smart Student!

$11.99
Satisfied 123 Students

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.

The Absolute Best Books to Ace Algebra

$14.99
Satisfied 1 Students
$14.99
Satisfied 92 Students
$15.99
Satisfied 125 Students

Related to This Article

What people say about "Number Properties Puzzle – Challenge 17 - Effortless Math: We Help Students Learn to LOVE Mathematics"?

No one replied yet.

Leave a Reply

X
45% OFF

Limited time only!

Save Over 45%

Take It Now!

SAVE $40

It was $89.99 now it is $49.99

The Ultimate Algebra Bundle: From Pre-Algebra to Algebra II