Algebra

posted by Cheyenne

Pick a number. Multiply by 2. Subtract 8. Divide by 2. Add 4. What is the result? Use algebra to show why the tricks work.

  1. MsPi_3.14159265

    Try first with a number...
    say 7
    first multiply by 2, that is 7x2=14
    subtract 8, that is 14-8=6
    divide by 2, that is 6/2= 3
    add 4, that is 3 + 4 = 7
    So what happened to your original number??

  2. Bosnian

    x = your number

    ( x * 2 - 8 ) / 2 + 4 = x * 2 / 2 - 8 / 2 + 4 = x - 4 + 4 = x

  3. Cheyenne

    (7×2)-8÷2+4=7

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