In grade 3 we are learning to round to the nearest 10 and the nearest 100. When we teach this, we often start by using number lines because they are a very visual way of seeing where a number is in relation to the nearest 10 or 100. Here is a video I made which explains the way that I taught rounding in class if you are reviewing this with your child.
Rounding to the Nearest 10 and 100
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