Math Riddles for Adults Ready to Crunch Numbers

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

Using only addition, add eight 8s to get 1,000. What is one solution?

A bat and a ball cost $1.10. The bat costs $1 more than the ball. How much is the ball?

If 5 machines make 5 gadgets in 5 minutes, how long do 100 machines need for 100 gadgets?

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

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 one half and add 10. What do you get?

I make every product zero when multiplied. What number 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?

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

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

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

How many times can you subtract 5 from 25?

A clock loses 5 minutes every hour. After 6 hours, how far behind is it?

What is half of two plus two?

A price rises 50 percent, then falls 50 percent. What happens overall?

What number has no value unless it stands beside another digit?

If three workers build three tables in three hours, how many tables can six workers build in six hours?

A square has area 64. What is its perimeter?

What comes next: 1, 1, 2, 3, 5, 8?

I am a two-digit number. My digits add to 9 and reverse to make 27 more. What am I?

If x plus x plus x equals 42, what is x?

A dozen eggs cost $3. How much do eight eggs cost at the same rate?

What is 10 percent of 10 percent of 1,000?

What shape has infinite lines of symmetry?

I am the total when all angles in a triangle gather. What am I?

I am the number that is both a square and a cube under 100. What am I?

I am the grin when the arithmetic finally clicks. What am I?