QuickBooks 2012 Calculation and Editing Tricks

QuickBooks 2012 makes it easy to calculate numbers. If the selection cursor is in an amount field, you can use these symbol keys to make quick calculations:

Press This Key	This Happens
+	Adds the number you just typed to the next number you type
–	Subtracts the next number you type from the number you just typed
*	Multiplies the number you just typed by the next number you type
/	Divides the number you just typed by the next number you type

If the selection cursor is on a date field, you can use these tricks to edit the date:

Press This Key	This Happens
+	Adds one day to the date shown
T	Replaces the date shown with today’s date
–	Subtracts one day from the date shown
Y	Changes the date to the first day in the year
R	Changes the date to the last day in the year
M	Changes the date to the first day in the month
H	Changes the date to the last day in the month

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Source:http://www.dummies.com/how-to/content/quickbooks-2012-calculation-and-editing-tricks.html