pyöristyssääntö

Pyöristyssääntö, also known as rounding rules, are conventions used to approximate a number to a specified precision. These rules are essential in various fields such as mathematics, engineering, and computer science, where exact values are often impractical or unnecessary. The most common rounding rules include:

Round half to even (also known as bankers' rounding): This is the most widely used rounding rule. In this method, a number is rounded to the nearest even number if it is exactly halfway between two others. For example, 2.5 rounds to 2, while 3.5 rounds to 4.

Round half away from zero: In this rule, a number is rounded to the nearest number that is further from zero if it is exactly halfway between two others. For example, 2.5 rounds to 3, while 3.5 rounds to 4.

Round down (towards negative infinity): This rule involves rounding a number down to the nearest lower value. For example, 2.9 rounds to 2, while 3.1 rounds to 3.

Round up (towards positive infinity): This rule involves rounding a number up to the nearest higher value. For example, 2.1 rounds to 3, while 3.9 rounds to 4.

Rounding rules are crucial in ensuring consistency and accuracy in calculations, especially in fields that require precise measurements and computations. The choice of rounding rule depends on the specific requirements of the application and the context in which it is used.