LG -G510 User Manual page 177

Calculator
You can view the result by pressing
If you want to continue the calculation, repeat the process.
Use [Back] key to erase any numbers or signs. Press
key if you want to end the calculation process.
If you press
If you press
74
This contains the standard functions such as
+, –, *, ÷ :
and
Input the numbers by pressing numeric keys.
Use a navigation key to select a sign for
calculation.
Then input the numbers followed by the sign.
key, you can input a minus number. In addition,
key, you can input a prime number.
.
[Result] key.