TIL how to multiple 5 times any crazy number without a calculator
wish i had known this shit in elementary school, wouldβve been useful lol
Discussion
Add a zero then cut it in half?
yeah cut it in half
lets say itβs 5x962 canβt really cut 9 in half so you cut 96 = 48, then 2 into 1 and then add the 0, = 4,810
But if the number you canβt cut in half is in the middle like 5x692 then you cut the 3 digits in half 692 = 346 plus the 0 = 3,460
And so on
I personally like to cut it in half after adding a zero because then you never have a decimal or fraction
For instance 68299 would be 34149.5 if cut in half, but if you add the zero itβs a nice even 682990 which then becomes 341495
I did poorly in advanced algebra and calculus because in elementary school I got really good at math by creating or using all of these βhackβ strategies to solve problems and eventually when I had work on more advanced concepts I would miss the fundamentals π€£
I would always finish my times tables first though π
Ohhh thatβs litt I get around the decimal n fraction in a different way but if I just add the 0 in the beginning im cutting an extra step, appreciate that!!
& I can only imagine π€£ idk why they never taught me this!!
I too use ChatGPT
π€£π€£π€£ Iβm serious
Anyone can do this simple mental math
Coming from someone who doesnβt like math simply because I never had the right teacher to properly teach it to me
now I have become my own teacher lol
Add a 0 to the end then /2?
I should have read more.
I see you answered this already.
You should have seen how they tried to teach us multiplication in elementary/middle school.
Lattice method multiplication.
The dumbest thing and non practical in most application where you need to multiply.
They set us up for failure π£
I had a feeling at the very beginning math was gonna be pretty straight forward but then these teachers just complicated it all for me, Iβd always get to the answer in my own way but what killed me was the βshow workβ side of it where I explained how I got to it and they HATED it
Oh really? What's 5 * 9 then smart guy????