math for elementry school teacher

posted by .

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 -

x =original number

Mathematical operations:

x + 10

Multiply the result by 4 :

( x + 10 ) * 4

( x + 10 ) * 4 + 200

Divide by 4 :

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

[ ( ( 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

Similar Questions

2. Math 213 Elementary Math

20. Think of a number. Add 7. Double the result. Subtract 8. Double the result. Add 12. Divide by 4. Subtract 6. Your answer will be the original number. Explain how this trick works.
3. elementary

Think of a number. Add 7. Double the result. Subtract 8. Double the result. Add 12. Divide by 4. Subtract 6. Your answer will be the original number. Explain how this trick works.
4. Algebra

How do I express this in algebraic form? And could you please explain how you came up with the expression?
5. hheeelp

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?
6. Algebra

Pick a number. Double it. Multiply the result by 3. Add 24. Divide by 6. Subtract your original number. Is the result always the same?
7. Algebra

Jill asks each of her classmates to choose a number, then multiply the number by -3, add 2 to the product, multiply the result by -2, and then subtract 14. Finally, each student is asked to divide the result by 6 and record the answer. …
8. Math

Pick what age you would like to be (may be your actual age if you like). Add 10. Multiply the result by 4. Add 200. Divide by 4. Subtract your original number. The final result is 60. Explain how I knew that.
9. Math

Repeat the following procedure for the four given numbers. Add 7 . Double the result. Subtract 4 . Divide by 2. Subtract the original selected number. The 1st number is 1 . The result is 5 . The 2nd number is 4 . The result is 5 . …
10. math

think of a number. Triple it. Add 100. double the result. Add 100. divide the result by 4. subtract one a half time the original number. What is the result?

More Similar Questions