Star Wars Battle is a fun way to practice subtracting tens from a 2 digit number. This covers the common core standard 1.NBT.6. The game is played like the game of war. Divide the cards up evenly. Each player puts one card down. Each player subtracts the tens and whoever has the biggest number wins all the cards. Continue until all the cards are played. The player with the most cards wins.
This game is also included in a bundle.
Subtracting Tens from a 2 Digit Number Bundle
I also have games for adding tens to a 2 digit number.
Adding Tens to a 2 Digit Number Bundle