Doing Arithmetic Inside Registers - HP 10BII Owner's Manual

Doing Arithmetic Inside Registers
You can do arithmetic inside storage registers Ro through Ro. The result
is stored in the register.
New Number in Register
Old contents + displayed number.
Old contents — displayed number.
Old contents X displayed number.
Old contents + displayed number.
Example. Store 45.7 in R5, multiply by 2.5, and store the result in R5.
Keys: Display: Description:
@OODSDD 45.70 Stores 45.7 in Кз.
Docomo 250 Multiplies 45.7 in R4 by
2.5 and stores result
(114.25) in Ку.
3: Number Storage and Arithmetic 41