A great way to teach number recognition and addition is to play "roll and cover" math games. Here is a fun St. Patrick's themed game, although it can be played at any time of the year. All you need is "gold coins" (see affiliate link below) or you can use anything else like playdough or pom poms.
This Pot of Gold Roll & Cover game includes 2 levels of difficulty:
For younger children and toddlers, use the first page with numbers 1-6 and a single die. Roll the die and place a "gold coin" on top of the correct number. This can be played with multiple players or just one.
The second page is a more advanced version, which is great for learning addition. It includes numbers 2-12 and you roll two dice, add the numbers together, and place a "gold coin" on top of the correct number.
Reading a regular die can be hard for young children, so I have included a printable paper die that is larger and easier to count the dots. You can also find larger dice at a dollar store or through my affiliate link below.