Far out of the box
This is a far out one. I didn't make it up.
I read it in a kid's math book.
I didn't know. The answer caught me by surprise.
When does 5 + 3 = 1?
I read it in a kid's math book.
I didn't know. The answer caught me by surprise.
When does 5 + 3 = 1?
posted by Ragknot at
4:12 PM
17 Comments:
When your mathematics is rubbish ? :-)
Or when you are using base 7 and only have 1 digit to store the result ...
5 pails of paint + 3 toddlers = 1 big mess
5 gills + 3 gills = 1 quart
or 5 pints + 3 pints = 1 gallon
Good tries, and maybe as good as the book's answer. I don't think anyone will get the book's answer without a clue.
Thursday
Base 7 was very close
"mod 7" is what they usually call that base-seven-one-digit system.
And the gills/quarts and pints/gallons examples are instances of base eight arithmetic, where the "=1" really means "=10 base 8".
Ross?
What familiar system uses base 7?
days = 1 week
Oops, days = 1 week, with 1 day left over so days = days
Close enough Eke,
The fifth day plus 3 days is the first day.
The book said Thursday plus 3 days is Sunday (the first day).
The week is the only "familiar" base 7 that I can think of. Did the clue of "Thursday" help?
This post has been removed by the author.
Yes it did, thanks :-)
A very strange Tom, I must say.
A good way to start a Monday morning though !
5*0=0
3*0=0
5*0=3*0
5=3
working by this logic all numbers are the same
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