gnumeric-plugins-extra software package provides spreadsheet application for GNOME - additional plugins, 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 gnumeric-plugins-extra
gnumeric-plugins-extra is installed in your system.
Make ensure the gnumeric-plugins-extra package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnumeric-plugins-extra *
You will get with gnumeric-plugins-extra package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Mathematics |
| Package | gnumeric-plugins-extra |
| Version | 1.12.32-1+b1 |
| Description | spreadsheet application for GNOME - additional plugins |
| Sub Section | Math |