rounding rules

Notation of Integers:The general form of integers isZ= {……-2,-1, 0, 1, 2…}The Basic operations in math areAdditionSubtractionMultiplicationDivisionThe main rules that are used in the place of basic arithmetic operations:Estimation: Estimation means generally rounding to the nearest value. For Example 99 is rounded to the value 100. Because 99 is very nearer to 100. The values 91,92,93,94 are rounded to the value 90 because these are less than 95. The values 95,96,97,98 and 99 are rounded to the value 100 because it is greater than or equal to 95.