How to Estimate a sum by rounding.

• Round each decimal term that will be added.
• Add the rounded terms

Example: Estimate the sum of 0.988 + 0.53

• Round 0.988 + 0.53 to 1 + 0.5
• Add the rounded numbers to obtain the estimated sum of 1.5
• The actual sum of 0.988 + 0.53 is 1.518

Some uses of rounding are:

• Checking to see if you have enough money to buy what you want.
• Getting a rough idea of the correct answer to a problem