# Maths Trick 2

### Amazing 1089...

**Step 1**

Take two pieces of paper and hand one to a friend.

On yours, without letting them see, write the number 1089, then
fold the paper to keep it hidden.

**Step 2**

Ask them to think of a 3-digit number but, before they
write it down, ask them to put the numbers in order
from greatest to smallest. Don't let them show what they've written.

*Example: 543 *

**Step 3**

Below their number, ask them to write the same digits,
but in reverse order, from smallest to greatest.

*Example: 345 *

**Step 4**

Now, ask them to subtract the new lower number from the original one
they wrote.

*Example: 198 *

**Step 5**

Next, ask them to reverse the order of that number.

*Example: 891 *

**Step 6**

Then, get them to add this latest number and the previous
number together and show you the result.

*Example: 891 + 198 = 1089*

**Step 7**

Finally, you can reveal your own number, which (if they
have calculated correctly) will be exactly what they
have written...

*1089*

Amazing!

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