[Math Riddles](hard)
[famous] [Mathematicians]
[Raw mental math]
[Math with Legs]
[Mystery box]
100

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

Seven (remove the 's' to make "even").

100

E=MC^2

Einstein

100

$100: what is the value of 36 * 4?


144

100

How many legs do 10 chickens have in total?

20 legs

100

"We are two numbers: one is the number of sides on a triangle, and the other is the first prime number. What are we?"

3 & 2

200

What three positive numbers give the same result when multiplied and added together

1, 2, and 3.

200

Known as the father of the atomic bomb


J. Robert Oppenheimer


200

Solve: 19999-8888

11111

200

If you saw 40 octopuses, and one was missing a leg, how many legs would there be altogether?

319 legs

200

"If you take the number of months in a year and multiply it by the number of eggs in a dozen, what is the sum of the result with 66

12*12+66= 210

300


$300: What comes once in a minute, twice in a moment, but never in a thousand years?


The letter 'M'

300

we know him from PI day, he calculated the most precise value of Pi

Archimedes

300

Solve for x:

55*3=x+1

164

300

20 ants and 10 spiders got together for a tea party. Three of the ants are missing a leg.  How many legs are there in the tea party?

197 legs

300

The product of 20 divided by 5 and the sum of 3 and 7 is what number

40

400


One brother says of his younger brother: “Two years ago, I was three times as old as my brother was. In three years time, I will be twice as old as my brother.” How old are they each now?

they will be 20 and 10.

400

Known as the "Father of Geometry," this mathematician's most famous contribution is the Pythagorean theorem, which calculates the length of the sides of a right triangle.

Pythagoras 

400

Mental math:   

999 X 9


8,991

400

500 snakes and 500 dogs are at the dog park. The snakes eat 1/5 of the dogs. How many legs are left at the dog park in total?

1600 legs left.

400

the sum of the product of the number of planets in our solar system and  the number of ears on a dog and the number of months in a year

(8*2)+12= 28

500
  • $500: I speak without a mouth and hear without ears. I have no body, but I come alive with the wind. What am I? 


an Echo

500

$500: A Polish mathematician born in 1882, he made significant contributions to the fields of mathematics and physics, including the theory of relativity and quantum mechanics, and is best known for his namesake "Uncertainty Principle."

hint: he also may share a name with someone from breaking bad

Werner Heisenberg

500

666*2.5


1665

500

3 centipedes and 6 millipedes walk into a bar. 5 slugs 6 dogs, 5 chickens also walk in. How many legs are in the bar in total?

6,334 legs 

500

What is the product of the number of degrees in a right angle and the percentage of a dollar that equals a dime, divided by the number of quarters in a dollar?"

=225