xThink Calculator App

Click on these video links to see how the product works. Also see the screen captures below, and see Using xThink Calculator App.

Buy xThink Calculator App for iPad and iPhone.

ADDITION add some decimal numbers	SUBTRACTION subtract some decimal numbers	MULTIPLICATION a 2% drop in my mortgage rate saves me how much?
DIVISION 587 attendees. 301 are students. What is the percentage of students?	PI The balloon arch for our party must be 8 ft. high. How long to make the column of balloons?	TRIGONOMETRY The hypoteneuse is 35m; one angle is 40 degrees. What is the length of the adjacent side?
TEST YOUR CALLIGRAPHY: Can you duplicate this example (uses 0 to 9 and also an exponent)?

Screen captures

ADDITION add some decimal numbers	SUBTRACTION subtract some decimal numbers	MULTIPLICATION a 2 drop in my mortgage rate saves me how much?
DIVISION divide some decimal numbers	ROOT Roots of some decimal numbers	ANNOTATION adding annotations to your calculations