I learned this trick at 10 years old, today I still remember it at 65. I do a little different. For the total 28353 2+8=10, then I cast 9 so I have 1, 1+3+5=9 I cast 9 =0, now I only have the 3 left. Add the numbers until you get the total equal 9 or more. look at the top, 3+7=10, cast 9 =1, then add 4=5 , carry the 5 and add to the next addend, the first number is 6 plus 5 equal 11, cast 9 again, equal 2, 2+1+7=10, cast 9 equal 1, You don't need to write anything, just add the numbers mentally until you get 9 or more. If you get 9, start again, 2+8=10, cast 9 then you get 1 3+3+3=9 start again 7+6=13, cast 9 then you get 4 another trick, 7+6=13 ,1 plus 3 equal 4, the same as casting 9 8+8=16, cast 9 equal 7, same as adding 1 and 6 adding all number on the 6 addents equal to 75, then 7+5=12, cast 9 equal 3 same as adding 1 plus 2
Some may not realize, in a long list of numbers to add, you can also cast out nines between rows. For example- adding 647 + 3521 = will quickly give you a 1 as the root. 6+3=9, 4+5=9, 7+2=9. I learned this back in the early 80's when the cashiers at Radio Shack were writing prices on paper pads and adding them by calculator to tell me how much to pay for my latest project. I could easily verify their numbers while viewing their receipt pad upside down across the counter. Seems to me it should be 90% accurate.
Casting out nines has a problem with it for instance if the answer was 289 instead of 298, you would not know if it is right. So I suggest casting out elevens.
Dude!!! You just helped my son and I with homework lol. Us adults tend to forget certain arithmetic after a while :/ Thanks man great video i just subscribed too!
I learned this trick at 10 years old, today I still remember it at 65.
I do a little different. For the total 28353 2+8=10, then I cast 9 so I have 1, 1+3+5=9 I cast 9 =0, now I only have the 3 left.
Add the numbers until you get the total equal 9 or more. look at the top, 3+7=10, cast 9 =1, then add 4=5 , carry the 5 and add to the next addend, the first number is 6 plus 5 equal 11, cast 9 again, equal 2, 2+1+7=10, cast 9 equal 1,
You don't need to write anything, just add the numbers mentally until you get 9 or more.
If you get 9, start again,
2+8=10, cast 9 then you get 1
3+3+3=9 start again
7+6=13, cast 9 then you get 4
another trick, 7+6=13 ,1 plus 3 equal 4, the same as casting 9
8+8=16, cast 9 equal 7, same as adding 1 and 6
adding all number on the 6 addents equal to 75, then 7+5=12, cast 9 equal 3 same as adding 1 plus 2
Oh my word I was so discouraged about casting out nines UNTIL I saw your video thank you so much keep it up!!!
Me too everytime I do this I wrote stupid methods
Awesome!! You made it so simple to understand!
This was really good and your really good at math and your job.
Thanks
Just want to say thank u. It was really appreciated.
Thank you for this video!
Some may not realize, in a long list of numbers to add, you can also cast out nines between rows.
For example- adding
647 +
3521 =
will quickly give you a 1 as the root. 6+3=9, 4+5=9, 7+2=9.
I learned this back in the early 80's when the cashiers at Radio Shack were writing prices on paper pads and adding them by calculator to tell me how much to pay for my latest project. I could easily verify their numbers while viewing their receipt pad upside down across the counter. Seems to me it should be 90% accurate.
Hi Charles
Thank you so much, it help me to explain it to my son school work. (:
Stamps help me so much
Thank you so much, man!
Casting out nines has a problem with it for instance if the answer was 289 instead of 298, you would not know if it is right. So I suggest casting out elevens.
Why math has to be so complicated? Great video!
Lets go i finished my math tuanks to you
But what if u get a 0 would there need to match up with the additional number still
Great video
cool now i understand 😊
The big question is WHY does it work? Even for multiplication.
anurag yadav ji
Dude!!! You just helped my son and I with homework lol. Us adults tend to forget certain arithmetic after a while :/ Thanks man great video i just subscribed too!
Why would you do this???
Idk how to get 10009
This shit got me confused😞
「動画の音が良くない」、
WHAT DEVICE ARE YOU USING?
IT COULD BE THAT.
the video image is too poor, you need to fix it more
THE VIDEO IMAGE IS EXCELLENT. IT MUST BE THE SCREEN YR VIEWING ON.
EDIT;
I HAVE JUST TRIED ON 3 DIFFERENT DEVICES & ALL IS GOOD.
I don't like this video very bad 👎👎 video
Can I go to the bathroom?
Booii