What are some awesome mathematics tricks?

What are some awesome mathematics tricks? by @Phantomgraphman

Answer by Philip Lloyd:

You will fool or at least, surprise, almost everybody with this wonderful trick!

Give a person a calculator to use.

Tell them to type any three digits (example 839)

Tell them to repeat the digits so they get a six figure number (839839)

Then you show them how incredibly quick you are!

Just glance at the number and say, “That number will divide exactly by 13″.

Tell them to do it.

Glance at this answer and say, “That number now will divide exactly by 11”.

Tell them to do it.

Finally say, “Your answer will now divide exactly by 7”.

Tell them to do it and to their surprise, the final answer will be the first three digits they thought of!!! (ie 839)

It is a good exercise to get people to prove this always works.

What are some awesome mathematics tricks?

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