Syvum Home Page

Home > GMAT Test Prep > Print Preview

Arithmetic : Decimals

Preparation Just what you need to know !

 

Addition and Subtraction of Decimals

 

To add or subtract decimals,

  • write the decimals one below the other such that the decimal points are vertically aligned;
  • insert zeros to the right of the decimal fraction to fill any gaps so that all numbers have same number of digits to the right of the decimal point;
  • add or subtract the numbers in the same way as whole numbers (ignoring the decimal point); and
  • insert a decimal point in the result directly under the decimal points of the numbers added or subtracted.

Example
The separate weights in grams of four gold rings are 3.012, 5.6, 4.89 and 6. How much do the four rings weigh altogether?
Solution.

						  3.012
			5.600
			4.890
			+ 6.000
			19.502
			
The four rings altogether weigh 19.502 grams.

Example
Rebecca has $87. If she spends $9.56, how much money does she have left?
Solution.

						  87.00
			-  9.56
			77.44
			
Rebecca has $77.44 left.
Note that subtraction may be always verified by addition, e.g., 77.44 + 9.56 = 87.

 

GMAT Math Review - Arithmetic : Index for Decimals
 

GMAT Math Review - Arithmetic : Practice Exercise for Decimals

 

-
-
 
10 more pages in GMAT Math Review

Contact Info © 1999-2017 Syvum Technologies Inc. Privacy Policy Disclaimer and Copyright