You must log in or register to comment.
I thought you give 1 from 7 to 9 so it becomes 10+6 !!
You can do that, too.
Why wouldn’t you take the 1 from the 7 so it is 10+6?
This is what I go for…Just play in 10s. Alot easier IMO
NOT LIKE THAT YOU HEATHEN
No take one from 7 and its 10+6=16
Take 7 from 7 and its 16+0 =16
Take 11 from 7 and it is 20-4=16
This is how I think for sure.
not even ADHD related you’re just taking a route to something more readily available in your memory. that’s how brains are supposed to work.
to me the detour is -1+10. whenever i see a 9 i take 1 away from the other guy and then add 10.
9 x single digit mumber works similarly; except i take away 1 and complete that to 9 by adding a number next to it.
9x7 = ?
7-1 = 6
6+? = 9
9x7 = 63
9x7 = 70 - 7 = 63 in table of 9 too easy ! (nearly the same technic)
8x7 = 70 - 7x2 = 70 - 14 = 6 + 70 - 20 = 56 (6 from 10-4 from 14)7x6 = 5x7 + 7 = 70/2 +7 = 35 + 7 = 42 the answer to the life, the death and all the rest (5xa = 10/2 x a= 10a/2)
i mentioned the 5x trick elsewhere under this post but for me for some reason doing the halfing first is easier. so to me it’s a/2x10 instead.
A dozen years ago or so there was a huge uproar about “common core” mathematics, which was a new standard being used in the USA for teaching.
It was a politicized trendy topic and even so-called-intellectuals were jumping on the train and calling it a deranged way of learning math.
I looked into it a bit, and I swear this pic pretty much sums up one of the key methods they were teaching.
Basically just tricks that a lot of people figure out to simplify problems.
That’s exactly what it is. A way to help conceptualize and play with numbers. Stuff my bored ass was doing in school anyway before common core came around lol
Common core is still a thing. I wish I had common core as a kid. Makes way more sense.
I mean, sure, the choice of the “nice” numbers here is eccentric, but this is essentially the way math is taught nowadays. Only, instead of making 8 in this special case, the goal is usually to make 10 + leftovers because adding to 10 is always easy.
Here’s my (upper midwest) spicy mental math take: it should be big-endian and solved with backtracking for ripple carry/borrow. None of this starting-from-the-1’s-place-and-successively-incorporating-higher-order-digits nonsense. Extended carry/borrow is rare, and if you start with the most significant digits and give up/get bored part way through, the intermediate answer is in the ballpark of the real answer.
9 is one less than 10, and 7 is three less than 10, so combined, they’re four less than 20 = 16
This is literally how common core math works.
The answer is 69
420% of the time.Niiiiice
And here I always thought it was 1001 + 0111 = 10000.
10 + 7 = 17 17- 1 = 16
The legend said that it is how Gaussian elimination was discovered in europe
I’ve always done it this way and don’t have adhd
This is psychopathy. Clearly you just add the 1 to the 9 to make it 10 and subtract it from the 7 to get 6 and 10+6 = 16.
Idk I have adhd and my working memory is so poor that memorizing time tables was the only way. :/
