Riddle:

How can you make the following equation true by drawing only one straight line: 5+5+5=550? Can you figure it out?

Draw a line on the first plus sign that turns it into a 4! The equation then becomes true: 545+5=550. You could also change the equal symbol to a crossed out equal symbol which means "not equal to".

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Riddle:

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

Infinity! Technically you will never reach the door, as you can only move half the distance, no matter how small.

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Riddle:

Why is it easier to count cows than sheep?

You can use a cowculator.

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Riddle:

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?

Number 194.

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Riddle:

A sphere has three, a circle has two, and a point has zero. What is it?

Dimensions.

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Riddle:

In a stable there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable?

14 horses and 8 men. 14x4 plus 8x2 = 72 feet.

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Riddle:

What do mathematics teachers like to eat?

Pi.

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Riddle:

If 4+2=26, 8+1=79 and 6+5=111. Then, what is 7+3?

410.4+2=26 is because 4-2=2 and 4+2=6,so it is 26. Therefore, 7-3=4 and 7+3=10(410).

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Riddle:

What happened to the plant in the math classroom?

It grew square roots, of course.

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Riddle:

What is significant about 3661 seconds past midnight on 1st January 2001?