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Does rounding off count in decimal places? Today I was doing a maths test on Mathletics for school homework and there was a question that said give your answer to the first decimal. On my calculator, I got the number 5.196152423. I put in 5.1 for the answer. It said I got it wrong and the answer was 5.2, then I thought well hang on a minute, It might be more than 5.2. If you round off the second last decimal (2) it = 2 because the last decimal is less than 5 (rounding off) so then 4 = 4 because 2, the second last decimal is less than 5. Then I do the next decimal 2 and that = 2 then 5=5 then 1=2 because the decimal to it's right is 5. Then 6=6, then 9 should = 10 so 1=2 so the answer is 5.2 after all but I am wondering, do I count in the extra decimals? For example it would matter for this question: "give one decimal place for this number: 3.5447". Does it = 3.6 or 3.5????? :O I KNOW ITS STUPID I GOT THE QUESTION WRONG, OK, I WAS JUST TESTING IT OUT Mathematics - 4 Answers - 2012-02-22 23:01:49 Best Answer If they ask to round to the nearest decimal place, typically you round to the nearest tenth place. In higher math, chem, and physics, they usually ask to the nearest 3 decimal places All Answers Answer 1 If they ask to round to the nearest decimal place, typically you round to the nearest tenth place. In higher math, chem, and physics, they usually ask to the nearest 3 decimal places 2012-02-22 23:03:41 Answer 2 "give one decimal place for this number" means round the first decimal place. Because 3.5447 is closer to 3.6 than it is to 3.5, you round it to 3.6. I believe rounding is usually learned in early gradeschool. 2012-02-22 23:09:04 Answer 3 5.196152423 rounded to the nearest first decimal = 5.2 BECAUSE, you cut off the number after the first decimal 5.1|96152423 ; but you have to round that last digit based on basic rounding knowledge: You round UP if the number following the kept digit is equal to or greater than 5, you round DOWN if the number following the kept digit is less than 5. So for this example, you round the 1 to a 2, because the number following the 1 is 9, and 9 is greater than 5. Your second example: 3.5447 to one decimal place = 3.5 (Because the number following the kept digit "5" is less than 5.) Other examples: 5.12222 ---> 5.1 4.56778 ---> 4.6 3.23457 ---> 3.2 Hope that helps! 2012-02-22 23:09:45 Answer 4 wow, 5.196........ All you have to do is look at the number that follows the first number 5.19 because the 1 is followed by a nine and 9, you would say that it becomes a 2 because anything 5 and up you would round up, in this case you have a 9 which makes the 1 a 2 so your answer would be 5.2 2012-02-22 23:10:47 |
