Steren CAL-150 Instructivo De Uso página 176

Example:
Numeric values with up to 12 digits and 2 exponent digits
can be stored in the Ans memory. The Ans memory will not
delete when the calculator is powered off. Every time the
EXE button is pressed, the Ans memory will be replaced by
the operation's current value.
Example:
Sum of 78+56=134; the value 134 will be stored in the Ans
memory.