Odds and Evens...have you got any beans?

Here is a game from this site which would be great to play with an adult:

This game involves recognition of odd and even numbers and making and testing predictions. It is played in pairs.
Equipment:
15 items, such as beans, counters, cubes, gumnuts or acorns.
Rules:
In turn, each player takes 1, 2 or 3 objects until no objects are left. The winner is the person who has an odd number of objects.

Here are some great investigations from NRich a website full of great challenges and investigations.

Make 37

Go here to see another game which is great for your addition.  For hints, try this page.

Magic Vs
Here's another problem which gives you a chance to make different totals.

Think you know your times tables?  Then try this one...Shifted Times tables