Show HN: Speedsums • Hacker News Board

Re: Show HN: Speedsums

#21

Post by 3825 » Sat, Feb 08, 2014, 5:03 PM UTC

>> For future reference, 8 x 9 = 72. It should not take 3.04s to solve that next time.

I really disliked learning the multiplication tables. When faced with 8 * 9, my mind thinks 8 * 8 = 64 and adds 8 to it to get 72. :-/

Re: Show HN: Speedsums

#22

Post by ppod » Sat, Feb 08, 2014, 5:06 PM UTC

refrigerator wrote: post #8

iandanforth wrote: post #6

I think this kind of practice is great. However I don't think insulting learners is ever a good idea. "If you got below like 30 on your first attempt, you should probably practice a little before embarrassing yourself again."

I thought it would motivate people to try harder, but I guess it's backfiring... sorry! I'll change it

I liked it, it made me smile. The standard "have-an-amazing-day" tone of sites submitted here is grating after a while.

Re: Show HN: Speedsums

#23

Post by kjannis » Sat, Feb 08, 2014, 5:08 PM UTC

Pretty easy to add a js script to do the work ;) http://pastebin.com/2FP7meUU

Re: Show HN: Speedsums

#24

Post by refrigerator » Sat, Feb 08, 2014, 5:10 PM UTC

kjannis wrote: post #23

Pretty easy to add a js script to do the work ;) http://pastebin.com/2FP7meUU

I know, but it's a client side app so it will always be possibly to hack no matter what I do

Re: Show HN: Speedsums

#25

Post by mrkickling » Sat, Feb 08, 2014, 5:13 PM UTC

3825 wrote: post #21

>> For future reference, 8 x 9 = 72. It should not take 3.04s to solve that next time. I really disliked learning the multiplication tables. When faced with 8 * 9, my mind thinks 8 * 8 = 64 and adds 8 to it to get 72. :-/

I use to think of it like 10 and then subtract with the other factor. For example if you have 9x7, think 10x7 and then subtract 7. 70-7 = 63.

And if you have 9x9 just think 90-9=81.

9x10 = 100-10 = 90

9x15 = 150-15 = 135 and so on..

Re: Show HN: Speedsums

#26

Post by kjannis » Sat, Feb 08, 2014, 5:13 PM UTC

refrigerator wrote: post #24

kjannis wrote: post #23

Pretty easy to add a js script to do the work ;) http://pastebin.com/2FP7meUU

I know, but it's a client side app so it will always be possibly to hack no matter what I do

true, nice app though ;)

Re: Show HN: Speedsums

#27

Post by memming » Sat, Feb 08, 2014, 5:15 PM UTC

Only if I had a keypad! Typing numbers in a mini keyboard is so slow.

Re: Show HN: Speedsums

#28

Post by idiot900 » Sat, Feb 08, 2014, 5:17 PM UTC

FWIW I thought the insults were pretty funny. They put into context the uselessness of learning to multiply and divide marginally more quickly.

Re: Show HN: Speedsums

#29

Post by nwienert » Sat, Feb 08, 2014, 5:25 PM UTC

kjannis wrote: post #23

Pretty easy to add a js script to do the work ;) http://pastebin.com/2FP7meUU

What I came up with (vanilla js):

http://pastebin.com/Emitc698

Re: Show HN: Speedsums

#30

Post by selmnoo » Sat, Feb 08, 2014, 5:28 PM UTC

yojo wrote: post #15

cheat = function() { text = $('#question').text().substr(0, $('#question').text().length - 3).replace('÷', '/').replace('x', '*') $('#answer').val(eval(text)) }

Noob question: how would you... use that cheat?