Question: how did they find this out that it works? when did they start noticing a pattern in numbers with 11 and 12 and other large numbers?
comments: i found this really helpful because multiply large numbers has never been easy for me and i always have to write it out and do it the long way. the eleven one really is so easy i like this one a lot its a super easy pattern to remember and these little rules will help me to finish on timed test in college a lot faster when i dont have a calculator but what i really think is interesting is how people found out these work like who took the time to find these patterns.
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