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#62 to #21

bagguhsleep (07/04/2013) []
It'd be easier to just separate the equation into (82*80)+(82*4).
#75 to #62

psykobear (07/04/2013) []
Take it even further:
(82*8)*10 + (82*4)
Further:
((80*8)+(2*8))*10 + (80*4)+(2*4)
FURTHER:
(((8*8)*10)+(2*8))*10 + ((8*4)*10)+(2*4)
Now just start at the innermost parenthesis and work outward:
((64*10) + 16)*10 + 32*10 + 8
(640 + 16)*10 + 320 + 8
6560 + 320 + 8
6880 + 8
6888
82 * 84 = 6888
(82*8)*10 + (82*4)
Further:
((80*8)+(2*8))*10 + (80*4)+(2*4)
FURTHER:
(((8*8)*10)+(2*8))*10 + ((8*4)*10)+(2*4)
Now just start at the innermost parenthesis and work outward:
((64*10) + 16)*10 + 32*10 + 8
(640 + 16)*10 + 320 + 8
6560 + 320 + 8
6880 + 8
6888
82 * 84 = 6888
#208 to #21

ponieskilledmyacc (07/04/2013) []
I got stuck at 18x16... this method isn't that easier..
#244 to #208

thumbsupforyou ONLINE (07/05/2013) []
18*16=10*(18+6)+8*6=240+48=288
Works for all numbers between 10 and 20, just notice that you have to subtract 10 after adding the numbers (or just not adding the 10 at all like I did)
Too bad I have no idea how to make 10082 easier in any way
Works for all numbers between 10 and 20, just notice that you have to subtract 10 after adding the numbers (or just not adding the 10 at all like I did)
Too bad I have no idea how to make 10082 easier in any way
#41 to #21

mrhotwings (07/04/2013) []
I always have trouble with these type of problems until I thought of doing this.
Problem: 10082
Remove the two from 82: 10080=20
Bring in the two: 202=18
10082=18
I seriously hoped this helped, I am rather bad when it comes to explaining things.
P.S. I said the word problem so many times, it doesn't even sound like a word anymore....
Problem: 10082
Remove the two from 82: 10080=20
Bring in the two: 202=18
10082=18
I seriously hoped this helped, I am rather bad when it comes to explaining things.
P.S. I said the word problem so many times, it doesn't even sound like a word anymore....
#45 to #41

anon (07/04/2013) []
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#137 to #67

grandterskrasao ONLINE (07/04/2013) []
less... than a hundred.. but greater than 1000? ... wut? I know i haven't had too advanced math, my highest being half a class of trig, but im pretty sure there is no such number.
#104 to #68

drulludanni (07/04/2013) []
what i would do is change it to 50*60 = 3000
then + 3* 50 to get 60 to 63 again so its 50*63=3150 and then  3* 63 to change 50 to 47 which equals 2961. It might not be the easiest way but it works and is faster than the conventional way in most cases and its what i use most of the time when multiplying in the head.
then + 3* 50 to get 60 to 63 again so its 50*63=3150 and then  3* 63 to change 50 to 47 which equals 2961. It might not be the easiest way but it works and is faster than the conventional way in most cases and its what i use most of the time when multiplying in the head.
#193 to #147

psychrophile (07/04/2013) []
If you're going to go through that extra work, why not just multiply 96x100 and subtract (3x96 = 288)?
#165 to #160

lmaopwnt (07/04/2013) [] Excuse me for trying to help someone, if you don't like not being able to do math then stop playing the dumbass and learn to do it yourself like I did. People overestimate the difficulty of math all the time, once you stop being intimidated by it and get the hang of it it's just as easy as doing it on paper.
#224 to #125

silverlance (07/05/2013) []
This is the worst thing I've seen all day all week all my life
#16

mrparkinglot (07/04/2013) [] or you could... I don't know..... USE A CALCULATOR?
I mean... they are everywhere now, on your phone, your computer on your.. yeah calculator
I mean... they are everywhere now, on your phone, your computer on your.. yeah calculator
#114 to #113

lizardnigger (07/04/2013) []
But in a non calculator exam...
Also, the grid method works
Also, the grid method works
#117 to #116

lizardnigger (07/04/2013) []
Meh, well, I'm a nerd and I usually have 20 minutes left for every hour
#119 to #118

lizardnigger (07/04/2013) []
I got an A in my last maths exam
My teacher says I can get an A* so I did it again and tbh I'm expecting one
I check my exam, then sit there and do nothing and then steal water at the end of the exam
My teacher says I can get an A* so I did it again and tbh I'm expecting one
I check my exam, then sit there and do nothing and then steal water at the end of the exam
#6

hounding (07/04/2013) []
useless for anything less than 80*80ish because you would end up multiplying double digits anyway
ex: 78*75
22+25=
22*25=
why have i wasted 15 minutes of my life on this ._.
ex: 78*75
22+25=
22*25=
why have i wasted 15 minutes of my life on this ._.
#65 to #6

anon (07/04/2013) []
78 x 75
1. 10078=22, 10075=25
2. 22+25=47, 10047=53
NOW: 5 will be your first digit. Save the 3 for later.
3. 22 x 25=550
NOW: Take the 3 from the last step, and add it to the first digit of this answer. Stick your first digit from earlier (5) in front.
4. 78 x 75= 5850
BItch.
1. 10078=22, 10075=25
2. 22+25=47, 10047=53
NOW: 5 will be your first digit. Save the 3 for later.
3. 22 x 25=550
NOW: Take the 3 from the last step, and add it to the first digit of this answer. Stick your first digit from earlier (5) in front.
4. 78 x 75= 5850
BItch.