Homework Help: math for elementry school teacher

Posted by deadlove on Thursday, February 9, 2012 at 1:48am.

Mr. Mathemagician asks you to pick any whole number. Add 10. Multiply the result
by 4. Add 200. Divide by 4. Subtract your original number. Mr. Mathemagician says,
“You’re final result is 60!” Explain Mr. Mathemagician’s trick?

math for elementry school teacher - Bosnian, Thursday, February 9, 2012 at 7:05am
x =original number

Mathematical operations:

Add 10 :

x + 10

Multiply the result by 4 :

( x + 10 ) * 4

Add 200 :

( x + 10 ) * 4 + 200

Divide by 4 :

[ ( x + 10 ) * 4 + 200 ] / 4

Subtract your original number :

[ ( ( x + 10 ) * 4 + 200 ) / 4] - x

Equation is:

[ ( ( x + 10 ) * 4 + 200 ) / 4 ) ] - x =

= ( x + 10 ) * 4 / 4 + 200 / 4 - x =

x + 10 + 50 - x = 60

Answer this Question

Related Questions

hheeelp - Mr. Mathemagician asks you to pick any whole number. Add 10. Multiply ...
Math - a. Write down a secret number, which can be any whole number Multiply by...
algebra - I know its true but why? When you multiply a whole number by a whole ...
math - suppose you add 8 to a number, then multiply by -4, and then subtract 5...
math - suppose you add 8 to a number , then multiply by -4 and then subtract 5...
math - Decrease a number by 5, divide the result by 2, then add 17 and multiply ...
Math - A census-taker rings Mr. Manning's bell and asks how many children he...
COMPUTERS-EXCEL 2007 - which one of the following formulas accurately describes ...
math - What are the divisibility short cuts that help you out? Odd numbers can ...
math - polk elementry school has three classes for each grade level, ...

For Further Reading

First Name:
School Subject:
Answer: