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We’ve seen the cute roller coaster rounding poster but does this really teach our students how to round? Once again, we must take the time to teach students why.
Why do we ‘round up’ when a number is 5 or more?
How can we teach rounding effectively? By using number lines.
By teaching students to use number lines, we can help them see why ‘5 or more round up’ while ‘4 or less round down’. Number lines show the distance for a number that is 5 or more is closer to the next number while the a number that is ‘4 or less’ is closer to the number prior.