Selects and uses tools appropriately. Uses estimation to predict results of computation. Finds and uses estimates to determine reasonableness of answers. Compares, sequences, and orders numbers. Understands the concepts of ratio and proportion.
Measures objects and events.
Understands the concepts of and relationships among linear dimensions, area, and volume. Finds perimeter, area, and volume. Understands the concept of rate and the procedures for calculating rates and determining units. Understands how to select tools which will provide precise measurement. Understands and uses the US and metric systems of measurement.