What the modifier keys do, the everyday entry keys, and how to fix a typo without retyping the line.
Ix²
One key, up to three jobs
White label, printed on the key: just press it.x² squares a number.
Blue label above: press 2nd first, then the key.2ndx² inserts the √□ template.
Green letter above: press ALPHA first.alphaIx² types the letter I.
Common key combinations
2ndquitmodeQUIT: jump back to the home screen from anywhere.
2ndans(−)ANS: paste your last answer into a calculation.
alphaf1y=F1: open the fraction templates.
Fixing typos. The arrow keys walk the cursor through what you've typed, del deletes the character under it, and 2ndinsdel (INS) switches to insert mode so new characters slide in instead of overwriting. clear wipes the whole line. (The key map at the start of this topic shows exactly where each key sits on the keypad.)