Here are two place value games for students: battleship and human place value chart. Battleship is a partner game. The human place value chart game will get them out of their seats. I love the digit necklace each student is wearing to play!
Counting and Measuring with Lego: Preschool Maths Game - Good way to visually compare numbers - I would suggest making the corresponding numbers (like 5 and 15 or 8 and the same color to help see the pattern relationship between the numbers and 15