We will be arriving in Paris on a Tuesday and leaving the following Tuesday. I will be buying the Navigo Decouverte which expires at midnight on Sunday. Am I able to add individual tickets or a carnet for our travels on Monday and Tuesday to the ND pass?
Thanks!

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Paris by Train - a great resource - states that it is now possible to add up to two day passes to your Navigo Decouverte card, which should meet your needs.

You can load a day pass on your navigo.

If you are leaving Paris through CDG, you might load a zone 1-5 weekly pass for your second week as it will include the RER B to the airport. This can be done anytime after Thursday but this will unlikely be the cheapest option.

If you just want to use tickets t+ to move about Paris on Monday and Tuesday, you will need to either purchase individual tickets t+ at 1.90€ or ten at 16.90€. Tickets t+ may only be electronically loaded onto the Navigo Easy pass (2€), ten so loaded will cost 14.90€.

In case that is not clear, and it may not be to someone who doesn't know Paris metro tickets/passes that well, the answer to your question is NO.

You can only add Navigo day passes to it, which isn't a bad idea usually, that is the same as the Mobilis day pass ticket which is unlimited travel for one day and costs about 7.5 euro for zones 1-2. But if you only want a few tickets, no, you cannot add them.

Thanks for your help!

I did my initial research using parisbytrain.com website and agree it is very useful. Duh, we leave on Tuesday and will be spending Monday night at a hotel near Roissypole. Looks like I'll only need a Navigo or Mobilis one day pass (1-5 zone) or individual tickets for Monday.

Merci all and looking forward to visiting Paris at Christmastime!