Monday, 4 November 2019

algebra precalculus - Multiplication problem



I was solving the one physical numerical during which i came through a calculation
1255×(170.4741)×(10001)×(148.26)3



Answer given by them is :1.903×103



But when i calculated value of (148.26)3 in calculator it came 0.0000000000.




So i thought that i am wrong because 0 multiply by anything should be zero.



but then i multiplied the rest of value with 0.0000000000 the calculator give me the answer1.903×103!! Which was correct answer.



Why did calculator showed that answer??



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Answer




The calculator probably rounded the number at a specific point (that is what my calculator does). I do not like to use decimals, so I will use fractions.
1255×170.474×1000×(148.26)3
=1255×170.474×1000×148.263
=1255×170.474×1000×1112398.871976
=213944870×1112398.871976
=213944870112398.871976
Plugging this on my calculator gives me 1903.443213, which is about 1.903×103 (technically it is 1.903443213×103, but the calculator probably rounded the decimal).



Even if the calculator gave an answer of 0.000000, do you really believe that (148.26)3=0? It does not make sense. Just use another calculator like Google's calculator, and you should get 8.89688644e6, which is 8.89688644×106


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