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2.8. Decimal Subtraction Using Front-End Estimation - YouTube
Estimating Sums and Differences with front end estimation - YouTube
3.1 Rounding And Estimating
Mr. O'Brien's 4th Grade Blog: Estimating Adding and Subtracting by
Estimating Sums & Differences Worksheets
How to estimate a Sum by Front End Estimation? - Assignment Point
PPT - What are different ways you can add? PowerPoint Presentation