Usually cash registers do the math for you. I also think some of how they teach basic math is too complex. For example I remember having to memorize all the number you get when you do 8 times 1 to 10. However 8*6 is much easyer if you do 3*2*2*2*2. I get 48 much faster if you break each number into small primes that are easyer to work with.
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