Rounding numbers is a very simple technique that trades accuracy for ease of calculation. It enables the creation of satisfactory approximations that are easier to work with. The numbers are rounded to a number with the desired number of decimal places that is closest to the starting number. Numbers can be rounded up or rounded down to the nearest value with fewer decimal places.
Example: Let us say we want to round a number with one decimal place to an integer. If the last digit behind the decimal point is 5 or greater than 5, then we round up. If the last digit is lesser than 5, we round down. So, if we have the value 12.6 and we want to round it to the nearest integer, 12.6 will be rounded to the value of 13. If the value we need rounded is, for example 17.2, then we round it down to the value of 17.
Rounding numbers exams for teachers
|Exam Name||File Size||Downloads||Upload date|
|Rounding numbers – very easy||144.1 kB||432||October 13, 2012|
|Rounding numbers – easy||145.2 kB||364||October 13, 2012|
|Rounding numbers – medium||146.8 kB||445||October 13, 2012|
|Rounding numbers – hard||151.9 kB||360||October 13, 2012|
|Rounding numbers – very hard||151.5 kB||358||October 13, 2012|
Rounding numbers worksheets for students
|Worksheet Name||File Size||Downloads||Upload date|
|Rounding numbers||494.6 kB||514||October 14, 2012|
The similar principle can be applied to rounding any number with more decimal places to a number with fewer decimal places. As an example, if we want to round the value 3.712859, which has 6 decimal places to a value with 4 decimal places, using the rule mentioned above, the value will be rounded up to the value of 3.7129.