Rounding can be a challenging skill. Help your students better understand rounding, to the nearest 10 and 100, using interactive number lines, hands-on rounding activities, games and independent practice.
This is an image from this resource on the Internet4Classrooms' "Seventh Grade Interactive Math Skills - Estimating" resource page: Approximation. This game requires an understanding of rounding off numbers. It includes separating numbers into their constituent parts (level 1), rounding to decimal places (level 2) and significant figures (level 3).