I always love a good set of number cards. They can be used for so many things. My students enjoy using these cards to play math war. It is played like you would with a traditional deck of cards. The only difference is these are two digit numbers. It is really good for number sense too. Students can draw 3 to 5 cards at a time and sequence them from least to greatest. They can also draw a card and then build the number with base ten blocks. Two digit math cards are great for two digit addition and subtraction practice. The use for these cards is endless and really up to you and your students. The most important thing to remember is that the students can learn and have fun at the same time.