First Grade Measuring Lengths Digital Activities CCSS K.MD.A.1 with Printable WorksheetsAn interactive math lesson for learners in 1st Grade on measuring lengths. Learners will be able to compare, describe and solve practical problems for lengths and heights [for example, long/short, longer/shorter, tall/short, and double/half]. They will be able to measure and begin to record lengths and heights. By the end of this unit, children will be able to:Understand the concept of measurement using cent