These games are perfect for the on-going reinforcement of rounding skills. I created these as a center activity for my students and it can be used as class practice, center practice, or homework. There are also other products in my Teachers Pay Teachers store for reinforcing the concept of rounding.
Simply copy the page matching the skill you wish to reinforce. There is a page for rounding a 2-digit number to the nearest ten, rounding a 3-digit number to the nearest ten, and rounding a 3-digit number to the nearest hundred.
Provide students with a 6-sided die, or a decahedron (10-sided die). I have found that decahedrons are useful for practice basic facts and creating numbers because they have 0-9 on them.