Front End Estimation
Here is a simple explanation with whole numbers.
Adding Decimals using a Decimal Square
Adding Decimals Using Decimal Models
Subtracting Decimals with Decimal Models
*Please note that in the video there is an error at the very end. Mrs. Kewriga accidentally says 5 hundredths, rather than 5 tenths. The 5 in the answer is in the tenths place.