Math Riddles for Adults Ready to Crunch Numbers

I am an odd number. Take away a letter and I become even. What number am I?

Using only addition, add eight 8s to get the number 1,000.

A bat and a ball cost $1.10. The bat costs $1.00 more than the ball. How much is the ball?

If it takes 5 machines 5 minutes to make 5 gadgets, how long would it take 100 machines to make 100 gadgets?

What three numbers give the same result whether they are added or multiplied together?

I am a three-digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I?

A farmer has 17 sheep and all but 9 run away. How many are left?

Divide 30 by half and add 10. What do you get?

I am a number that when multiplied by any other number stays the same. What am I?

What weighs more: a pound of feathers or a pound of bricks?

How can you add eight 4s together so the total equals 500?

There are two ducks in front of a duck, two ducks behind a duck, and a duck in the middle. How many ducks are there?

In a race, you pass the runner in second place. What place are you in now?

A number doubled is 20 more than the number itself. What is the number?

How many times can you subtract 5 from 25?