Averages and Rounding Resource several lessons on estimating and rounding Estimating and rounding decimals Estimating and rounding decimals math.com Estimating & Rounding Decimals (3.1.1c) math.com Estimation and Sequences Resource Estimating and rounding decimals Estimation and Sequences Resource Averages and Rounding Resource http://www.math.com/school/subject1/lessons/S1U1L3GL.html