If you want to have a nice and clean Raspberry Pi Noobs installation. Execute te followings commands to remove unless tools:
sudo apt-get purge wolfram-engine (Reduce image size with 683MB)
sudo apt-get purge sonic-pi (Reduce image size with 151MB)
sudo apt-get purge scratch (Reduce image size with 93MB)
sudo apt-get purge scratch2 (Reduce image size with 147MB)
sudo apt-get purge scratch3 (Reduce image size with 147MB)
sudo apt-get autoclean
This initial Noobs image size will now be arround 4GB 🙂