## Measurement

In Grade One, students continue to develop their understanding of length and how it is measured. They first compare lengths of objects by indirect and direct comparison and then use linear units to measure objects and compare measurements. Students learn about iterating a unit and about the relationship between sizes of units and the results of measuring: the smaller the unit, the greater the count for the same length.

Benchmarks

• Identify sources of measurement error

• Recognize that the same count of different-sized units yields different lengths

• Recognize that, when measuring the same length, larger units yield smaller counts

• Measure objects using inches and centimeters

• Use a ruler to measure lengths longer than one foot

• Solve problems involving the beginning time of an event, ending time of an event, and

duration of the event; given two of these, find the third for events beginning and ending

on the hour or half-hour

• Use a timeline to record and determine duration to the hour or half-hour

• Identify sources of measurement error

• Recognize that the same count of different-sized units yields different lengths

• Recognize that, when measuring the same length, larger units yield smaller counts

• Measure objects using inches and centimeters

• Use a ruler to measure lengths longer than one foot

• Solve problems involving the beginning time of an event, ending time of an event, and

duration of the event; given two of these, find the third for events beginning and ending

on the hour or half-hour

• Use a timeline to record and determine duration to the hour or half-hour