Rounding numbers

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

Rounding numbers exams for teachers

Exam Name File Size Downloads Upload date
Rounding numbers – very easy 144.1 kB 1330 October 13, 2012
Rounding numbers – easy 145.2 kB 1436 October 13, 2012
Rounding numbers – medium 146.8 kB 1589 October 13, 2012
Rounding numbers – hard 151.9 kB 1181 October 13, 2012
Rounding numbers – very hard 151.5 kB 1351 October 13, 2012


Rounding numbers worksheets for students

Worksheet Name File Size Downloads Upload date
Rounding numbers 494.6 kB 1489 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.

Rounding knowledge test