Where do I find a 99x99 multiplication table?

Here’s a spreadsheet with that data (tab-separated values). If you prefer another format or need any other tools, let me know.

multiplication_table.csv (44.4 KB)

99-times-table.ods (103.3 KB)

The files above can be opened with a free spreadsheet program called LibreOffice.

There’s also a text version here in list format:

multiplication.txt (126.6 KB)

multiplication.txt with spaces (145.3 KB)

Thank you John! This saved me a lot of time.

What’s your plan with those?

Memorize I read in Alberto Coto’s book Entrenamiento Mental that mental calculus athletes memorized the multiplication table 99 x 99 to use 2 numbers at a time by the cross multiplication method.

But I have no plans to memorize this table this month. I am involved in building the shadow system. I am struggling to finish my shadow system this week. Ah, thanks for helping me understand the shadow system😊

Big project… might wanna start with the squares 11^2 - 99^2 which will already allow you to do the 2-digit criss-cross approach you’ve mentioned, albeit via difference of squares. On the other hand, that’s a lot of impact for just 90 numbers. You can then start adding the rest of them as needed.

I’ve just done exactly that (memorized the squares). I’ll probably write a post about the method I’ve used once I got a bit of free time…

By request, I’ve just added a file that lists them like this:

```
2 × 2 = 4
2 × 3 = 6
2 × 4 = 8
2 × 5 = 10
2 × 6 = 12
2 × 7 = 14
2 × 8 = 16
2 × 9 = 18
...
99 × 90 = 8910
99 × 91 = 9009
99 × 92 = 9108
99 × 93 = 9207
99 × 94 = 9306
99 × 95 = 9405
99 × 96 = 9504
99 × 97 = 9603
99 × 98 = 9702
99 × 99 = 9801
```

See my comment above to download the entire file.

The files only show 2-99, because multiplying by 0 and 1 don’t require calculation or memorization.