My son's android tablet has 16GB total internal memory space. It has 13.38 GB available, but won't download anything else

[lennie49er]

My son's Android tablet has 16GB total internal memory space. It has 13.38 GB available, but won't download anything else because it says it has low memory space left & we have to delete some apps. what could be the problem & how can we solve it. It doesn't help that I added a 4 Gb sd card.

 

[Saga Lout]

It would help us to help you if we had the make and model of the device so we can work out what version of Android it runs. Some of them could benefit from a micro SdCard.