How to make a rounding off?

In many of our daily tasks, we do not need to use exact numbers. When we are using very huge numbers or numbers having lots of decimal positions, it is sometimes difficult to make a rounding so as to make calculations easier.

In the case of decimal numbers, we must first to decide how many positions we want to work with. Then, we analyse the first figure that is on the right of the figure that that we want to remove. If that figure is bigger than 5 or equal to 5, the last figure we want to keep increases 1. On the contrary, it stays the same. For instance:

• 12.495176 (4 decimal positions): 12.4952
• 12.495176 (3 decimal positions): 12.495
• 12.495176 (2 decimal positions): 12.50
• 12.495176 (1 decimal position): 12.5

If we are working with very huge numbers, it can be useful to make a rounding according to a certain order. Let’s see the same logic that is used for a rounding on decimal numbers. For instance:

• 815,129,645 (tens): 815,129,650
• 815,129,645 (hundreds): 815,129,600
• 815,129,645 (thousands): 815,130,000
• 815,129,645 (millions): 815,000,000

Check out our List of Questions to get to know a little more about the most diverse topics related to mathematics. If you have any pertinent (math) question whose answer can not easily be found, send us an email on the Contact page with the question. We will be happy to respond. In the event that you detect any errors in our answers, do not hesitate to contact us!