InfoTopic: When you start the app your iThing becomes a calculator, and you can refer to the screen as you read this description (tap the yellow key then tap WEB to toggle from the live app to this Guide, tap MAIN to toggle back to the live app): The opening screen looks like Fig. 1: Figure 1 Frrraction's opening screen. This is Frrraction's MAIN view. It contains seven regions:
0 + ( 0 over 0 ) The symbol '/' seen in F1n as '0/' in the screenshot is Frrraction's digitcursor which in realtime alternates between  and / looking like a single waving stroke, to show where the next input digit will go. Tapping any of the green fCells moves the digitcursor and the white background to the one you tapped, making it become "the active cell". The role of the white keys along the bottom of the screen is number entry. The white keys along the right edge of the screen trigger arithmetic operations. The yellow key exposes the rest of Frrraction's power and is described a bit later in a section of its own within this guide. 
TryIt: (starting with 0+0/0 in F1) with F1n active: Tap the key whose label is the digit 5. See where the digit went? See where the cursor is now? The little circled × in F1n is the cell's " Tap F1n's Clr button. Now F1 contains 0+0/0 again. Finish this TryIt by loading 5 into F1n again. 
TryIt: (starting with 0+5/0 in F1) and F1n active: Tap the 8key. Since 5 was already present, tapping 8 left the numeric value 58 in F1n. Next tap the green F1d key, then put the integer 82 into F1d by tapping the 8key then the 2key. Now F1 contains the pure fraction 0+58/82. Finish this TryIt by putting the integer 3 into F1i (tap the green F1i cell, then tap the 3key), so F1 contains the mixed fraction 3+87/123 
Things to find out: Math is not a passive subject. Frrraction helps you work with numbers in the relaxed atmosphere of your own handheld numbersupport system.

Fraction representations: Foremost among them are the pure ratio fraction mixed ratio fraction dot fraction continued fraction, egyptian fraction, 