concalc software package provides console calculator, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install concalc
concalc is installed in your system.
Make ensure the concalc package were installed using the commands given below,
$ sudo dpkg-query -l | grep concalc *
You will get with concalc package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Mathematics |
| Package | concalc |
| Version | 0.9.2-2+b1 [amd64, arm64, arme |
| Description | console calculator |
| Sub Section | Math |