logicmathsimplecleverUsing eight eights and addition only, can you make 1000?
888 + 88 + 8 + 8 + 8 = 1000
logicmathcleanCan you find four consecutive prime numbers that add up to 220?
47 + 53 + 59 + 61 = 220
logicmathsimplecleverI know a number which is spelled in an alphabetical order. Do you?
Forty.
logicmathWhat 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
and
12^3 + 1^3 = 1729
Taxicab number Ta(2)
mathlogiccleansimpleI am an odd number; take away a letter and I become even. What number am I?
7.
cleanlogicmathHow do you make the number one disappear by adding to it?
Add the letter 'G' and it becomes Gone.
logicmathtrickyHow many times can you subtract 5 from 25?
Just once, because after you subtract anything from it, it's not 25 anymore.
logicmathtrickyIf
1 = 5 ,
2 = 25 ,
3 = 325 ,
4 = 4325
Then 5 = ?
1
Already stated 1=5 => 5=1
logicmathsimplecleanThe digits 0-9(0,1,2,3,4,5,6,7,8,9) can be rearranged into 3628800 distinct 10 digits numbers.
How many of these numbers are prime?
None. The sum of numbers from 0-9(0,1,2,3,4,5,6,7,8,9) is 45 and therefore can be divisible by 3 and 9.
logicmathtrickyHow many sides does a circle have?
Two. The inside and the outside.
