Prep your paper with a headline ‘Bank Deposit’ and a listed total of ‘$100’, add a Withdrawals and Deposits column below - ask someone if they’re game.
How good are you with numbers? Even if you aren’t maybe you can help me figure out this number mystery?
So you’ve got a bank deposit of a hundred dollars in your account. Now in the first month you withdraw forty dollars…
Write down $40 in the withdrawals column.
This gives you a balance of $60, right? Bank deposit of $100 minus a withdrawal of $40…
Write down $60 in the balance column.
So far so good… next month you take out $30, leaving you with a balance of… $30.
Write down $30 in the withdrawals column and $30 in the balance column.
Next month you take out, say, $18, which gives you a balance of $12.
Write down $18 in the withdrawals column and $12 in the balance column.
Then in the last month, you withdraw an amount of $12, which gives you a balance of? $0 – it’s all gone. Let’s check… add up your withdrawals.
Tally up the withdrawal column to get $100 and write it down at the bottom.
Your onlooker should be on the same page.
Now on the right, if we add up the balance, we should get the same, right?
Tally up the balance column to surprisingly get $102 and write it down at the bottom.
You’ve got a surplus amount of $2, wow, how’d you do that?
This should get them smiling.
Some extra lines you can try
- Are you free, because I want you to do my tax returns.
- The return on your interest in this is worth every penny.
- We should go play the horses, because you’re a lucky charm.
Run through the numbers again to mysteriously get the same result.
Or try it out on someone in the accounts department for extra fun.