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math democrat
mathdemocrat.bsky.social
did:plc:dacqb5pqgmkpig2l5oo4n6m4
Simple mental math anybody can do! Multiplying by 11? Add zero and add. Example 17*11=170+17=187. 19*11=190+19=209.
Multiplying by 9 - know that the sum of the digits must be divisible by 9.
Add zero then subtract
->17*9=170-17=153.
->18*9=180-18=162.
2025-09-02T03:09:56.403Z