# 1089

You will have people saying “how in the world did you do that?”

Let’s say you are sitting with some friends.  Or better yet, children or grandchildren.  You volunteer to predict a four digit number. And you write it down on a card and turn it over.

You ask someone to write down three single-digit numbers without repeating a number. Then have them reverse the numbers and subtract the smaller from the larger.

You take that number, reverse it and add the two numbers together. The total will be “1089” — the number you wrote down on the card.

The good news is that – whatever the first three numbers are, the end result is always “1089.”   And no – I don’t know how it works.   Unless I take off my socks and shoes.   And even then. . . . . .

## 2 thoughts on “1089”

1. Robert Lindstrom

They must be single digit numbers. No 10,11 12, etc.

2. Richard Lamm

Hi Scott, if you add the 4 numbers in 1089 the sum is 18. Which when divided by 9 yields a number without a decimal. It often helps in accounting because if you total a bunch of numbers and the difference is a figure exactly divisible by 9, it is most probable that two digits were transposed. For example a 21 was incorrectly entered as a 12. A quick eyeballing can then spot the error.

My son who lives just a few miles south of St. Paul is in his 8th day of quarantine having tested positive for Covid19, as did our 12 year old granddaughter. Wife and grandson are negative so far. Mike is a policeman so he thinks tracing where he got infected is near impossible. In his city the police are generally the first responders.Both are just having mild symptoms so we are cautiously optimistic. Best, Dick P.S. Remember that 1492 manuscript? I finally located an expert in California who is confident of cracking it. Initially, he thinks it is a dialect that is Yiddish and there seems to be some references to the Basque region.

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