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beckerist@lemmy.world ⁨1⁩ ⁨year⁩ ago

7 is double the last number and subtract from the rest

749 (easily divisible by 7 but for example sake)

9*2=18

74-18=56

6*2=12

5-12= -7, or if you recognize 56 is 7*8…


I’ll do another, random 6 digit number appear!

59271

1*2=2

5927-2=5925

5*2=10

592-10=582

2*2=4

58-4=54, or not divisible

I guess for this to work you should at least know the first 10 times tables…

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