Math+Puzzles+Me

Hello! Do you have a math puzzle that you want to share?? Do you want to solve all the math puzzles?? Do you want to be the "Puzzle King"??
Well, if you want to, just post some math puzzles RIGHT HERE for other users to solve!!!

Please include a horizontal line after each puzzle!!!

1,3,6,10,15,21... What are these __numbers__ called? What is the formula to get the nth number? ~Ming Yang (I'm not sure whether this is considered a math puzzle...)

Are those triangular __numbers__? The formula for the nth triangular number is to add 1 through n, which is N(N+1)/2 (e.g. 1(2)/2=1, and 3(4)/2=6). Anyway you put the formula at Triangular numbers. ~Amanda

In class on 10th __April__(today), Ms Yong asked us about whether a circle has angles(For Resilient). Please share your thoughts about this puzzle.

An angle does not have any angles. Angles are only formed when two straight lines meet together. However, a circle only have a curved line, thus a circle will not have any angles. (I know that some people may think that the circle has a 360 degree angle) ~Ming Yang

Ming Yang is right. ~Amanda

(x-2x)+(3x-4x)+(5x-6x)=7x-8x+9x-10x+11x-12x What is x?

Er...can't it be anything? ~Amanda Is x -3 ? ~ Debbra WAY off-leash :/ ~ Jan Jay x is 0. ~Debbra

__Number Puzzles__ Add an equation (plus,minus,times,divide...)between each string of numbers to form the number at the end. Only single digit numbers are to be used. E.g1+2+...NOT12+... 123=4 /12=3 /432=1 /32=1 /1234=5 /5432=1 /12345=6 /65432=1 /135=7 /753=1 /246=8 /864=2

Too lazy. But 12=3 is 1+2=3, which is super obvious. ~Amanda

3-2=1 LOL ~ Jan Jay (5-4)X(3-2)=1 ~ Jan Jay (1+2)/3+4=5 ~ Jan Jay

Another puzzle

What is 1 cube plus 2 cube plus 3 cube plus ... plus 99 cube=???

Hint: Got to do with triangular numbers. ~MC

Jan Jay: Check this out, 1=1=1^2 1+8=9=3^2 1+8+27=36=6^2 1+8+27+64=100=10^2

(1+2+3+4...+99=4950) SO, the answer is 4950^2 which I am now going to use a calculator...

20 seconds later...

4950^2= __**24502500**__

__**Right answer :P**__