Your students have been captured by aliens and need to use rounding to escape. The game has 3 levels, which can be played in one day or over several days.
Level 1: rounding to the nearest 10
Level 2: rounding to the nearest 100
Level 3: rounding a number to both the nearest 10 and 100
My students have struggled with rounding this year. This game got them completely engaged and kept the whole group motivated. Students will be motivated to practice even when it is not their turn to earn "armor points" and avoid capture by the aliens.
You also can edit to add more (or fewer) pages depending on what your students are struggling with.