The Measurement Unit involves understanding the process of measuring—identifying the attribute being measured (such as length, area or time); identifying an appropriate unit (such as a unit of length, a unit of area or a unit of time); estimating the number of those units it will take to equal the object/distance/interval being measured; skillfully comparing the unit to the what is being measured (no gaps, no overlaps); and using a number and unit to communicate the measurement to someone else. Questions to be answered may include:

• What is the difference between length and area?

• What are the critical attributes of appropriate units of length? Appropriate units of area? Appropriate units of time?

• What do you notice about the relationship between the size of the unit and the number needed to measure an object, distance or interval?

Math Concepts and Skills: 

The student selects and uses units to describe length, area, and time.

The student:

• finds the length of objects using concrete models for standard units of length such as the edge of an inch tile or the face of a centimeter cube.

• explains the inverse relationship between the size of the unit and the number of units needed to equal the length of an object such as the longer the unit, the fewer needed and the shorter the unit, the more needed.

• determines the length of an object to the nearest unit using rulers, yardsticks, meter sticks, or measuring tapes.

• solves problems involving length including estimating lengths.

• reads and writes time to the nearest one-minute increments with analog and digital clocks and uses a.m. and p.m. to identify time of day.