What is the smallest number, that can be expressed as the sum of the cubes of two different sets of numbers?
Hardy-Ramanujan discovered 1729 as a magic number. Why 1729 is a magic number?
10^3 + 9^3 = 1729
12^3 + 1^3 = 1729
Taxicab number Ta(2)
Think of a number. Double it. Add ten. Half it. Take away the number you started with. What is your number?
Your number is 5.
Using eight eights and addition only, can you make 1000?
888 + 88 + 8 + 8 + 8 = 1000
How many sides does a circle have?
Two. The inside and the outside.
What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?
100. Looks hard? Don't worry, just work it backwards and you'll find it very easy.
If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?
pi * z * z * a
I know a number which is spelled in an alphabetical order. Do you?
There are 2 ducks in the front, 1 in the middle, and 2 in the back.... How many are there in total?
3 ducks in 3 rows. First in the front, one in the middle and last in the back.
Can you arrange four 9's and use of at most 2 math symbols, make the total be 100?
99 / .99
99 + 9/9
What is the largest number you can write with just 3 digits?