A better solution is to use a proof of work system instead and have your computer mine cryptocoins if you want to post.
Name:
Anonymous2018-10-04 22:11
>>5 2353*6399 is just 2353*6400 minus 2353 2353*6400 is just 2400*6400 minus 47*6400 47*6400 is just 50*6400 minus 3*6400 this is how I do math in my head