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Here’s another mathemagic trick you can learn that will astound your friends, neighbors, children, parents – and instill in them a new respect for the entertainment value of basic algebra. It's not hard to learn, and might work on your math teacher, as well. Instructions: Pick any number, and you must remember it (the victim thinks whatever, maybe 2, or 7 – but you think "x"). Multiply by 4. (Victim thinks: 8 or 28, you think 4x.) Add 5. (Victim: 13 or 33, you: 4x + 5.) Add 6. (Victim: 19 or 39, you: 4x + 11.) Subtract 3. (Victim: 16 or 36, you: 4x + 8; notice both parts of “4x + 8” divide evenly by 4.) Divide by 4. (Victim: 4 or 9, you: 1x + 2 or simply x + 2; notice that you've now returned to "x," the original number.) Now ... SUBTRACT YOUR ORIGINAL NUMBER. (The “x” is taken away! victim: 2 or 2, you: 2.) You now know exactly what your victim is thinking! So, now, you can add, subtract, multiply, and divide to your heart's content, know...

Here’s another mathemagic trick you can learn that will astound your friends, neighbors, children, parents – and instill in them a new respect for the entertainment value of basic algebra. It's not hard to learn, and might work on your math teacher, as well. Instructions: Pick any number, and you must remember it (the victim thinks whatever, maybe 2, or 7 – but you think "x"). Multiply by 4. (Victim thinks: 8 or 28, you think 4x.) Add 5. (Victim: 13 or 33, you: 4x + 5.) Add 6. (Victim: 19 or 39, you: 4x + 11.) Subtract 3. (Victim: 16 or 36, you: 4x + 8; notice both parts of “4x + 8” divide evenly by 4.) Divide by 4. (Victim: 4 or 9, you: 1x + 2 or simply x + 2; notice that you've now returned to "x," the original number.) Now ... SUBTRACT YOUR ORIGINAL NUMBER. (The “x” is taken away! victim: 2 or 2, you: 2.) You now know exactly what your victim is thinking! So, now, you can add, subtract, multiply, and divide to your heart's content, know...

Here’s another mathemagic trick you can learn that will astound your friends, neighbors, children, parents – and instill in them a new respect for the entertainment value of basic algebra. It's not hard to learn, and might work on your math teacher, as well. Instructions: Pick any number, and you must remember it (the victim thinks whatever, maybe 2, or 7 – but you think "x"). Multiply by 4. (Victim thinks: 8 or 28, you think 4x.) Add 5. (Victim: 13 or 33, you: 4x + 5.) Add 6. (Victim: 19 or 39, you: 4x + 11.) Subtract 3. (Victim: 16 or 36, you: 4x + 8; notice both parts of “4x + 8” divide evenly by 4.) Divide by 4. (Victim: 4 or 9, you: 1x + 2 or simply x + 2; notice that you've now returned to "x," the original number.) Now ... SUBTRACT YOUR ORIGINAL NUMBER. (The “x” is taken away! victim: 2 or 2, you: 2.) You now know exactly what your victim is thinking! So, now, you can add, subtract, multiply, and divide to your heart's content, know...