# Why does the calculator trick work?

The one that goes:
Key in the first three digits of your phone number (NOT the area code)
Multiply by 80
Add 1
Multiply by 250
Add the last 4 digits of your phone number
Add the last 4 digits of your phone number again
Subtract 250
Divide number by 2
Is there some mathematical explanation to that? If so,...
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The one that goes:

Key in the first three digits of your phone number (NOT the area code)

Multiply by 80

Add 1

Multiply by 250

Add the last 4 digits of your phone number

Add the last 4 digits of your phone number again

Subtract 250

Divide number by 2

Is there some mathematical explanation to that? If so, what?

Key in the first three digits of your phone number (NOT the area code)

Multiply by 80

Add 1

Multiply by 250

Add the last 4 digits of your phone number

Add the last 4 digits of your phone number again

Subtract 250

Divide number by 2

Is there some mathematical explanation to that? If so, what?

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3 answers
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