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Unusual Math

Anonymous Sun 25 Jan 2026 02:38:00 No.1555633 View View Reply Original Report

Could anybody explain please, from the following image, in what order are the colored multiples taken from the top numbers and sorted over the final product?
https://en.wikipedia.org/wiki/Lattice_multiplication#Derivations

Anonymous

View Same Google ImgOps iqdb SauceNAO 1769308680357975.png, 426KiB, 960x311

Anonymous Mon 26 Jan 2026 01:56:26 No.1555710 Report

Quoted By:

>>1555633
6 x 5 = 30
6 and 5 are both on the right of the factors so their product is written aligned to the right.
3 x 5 = 15, the 3 is one step to the left so the product is one step to the left.
2 x 5, the 2 is two steps away from the right
the products are written wherever you want on rows in any order which is why 2x7, 6x1 and 6x5 are on the bottom then 2x1 and 3x1 and 3x5 next, then 2x5 is third making 6x7

The black line pairs, then the medium grey, then light grey, then white. Do it however you like

There's a reason no one uses that layout for multiplying today. Very smart guy to figure it out but we've moved on from his foundation.

Anonymous

Anonymous Wed 28 Jan 2026 01:52:33 No.1555878 Report

Quoted By:

Thank you so much for your response. I had been bothered by this problem for a while and this is the closest to an answer I've found anywhere.

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