Students learn about the concepts of accuracy and approximation as they pertain to robotics, gain insight into experimental accuracy, and learn how and when to estimate values that they measure. Students also explore sources of error stemming from the robot setup and rounding numbers.

This task is a refinement of ``Carbon 14 dating'' which focuses on accuracy. Because radioactive decay is an atomic process modeled by the laws of quantum mechanics, it is not possible to know with certainty when half of a given quantity of Carbon 14 atoms will decay. This type of question is very important in science and it also provides an opportunity to study the very subtle question of how errors behave when applying a function: in some cases the errors can be magnified while in others they are lessened.

This lesson gives students a better perspective as to how acreage is determined. Using the computer in their pocket students learn to calculate area in feet and acres. Using their results the can calculate biomass, board feet per acre, or even the amount of electrical fencing needed to protect a meadow.

Measuring the dimensions of nano-circuits requires an expensive, high-resolution microscope with integrated video camera and a computer with sophisticated imaging software, but in this activity, students measure nano-circuits using a typical classroom computer and (the free-to-download) GeoGebra geometry software. Inserting (provided) circuit pictures from a high-resolution microscope as backgrounds in GeoGebra's graphing window, students use the application's tools to measure lengths and widths of circuit elements. To simplify the conversion from the on-screen units to the real circuits' units and the manipulation of the pictures, a GeoGebra measuring interface is provided. Students export their data from GeoGebra to Microsoft® Excel® for graphing and analysis. They test the statistical significance of the difference in circuit dimensions, as well as obtain a correlation between average changes in original vs. printed circuits' widths. This activity and its associated lesson are suitable for use during the last six weeks of the AP Statistics course; see the topics and timing note below for details.

Students participate in a measurement lesson focusing on length. They use their feet as the unit of measurement for furniture in the classroom and at home. They then sketch the pieces of furniture they measured.

Students investigate the weather from a systems approach, learning how individual parts of a system work together to create a final product. Students learn how a barometer works to measure the Earth's air pressure by building a model using simple materials. Students analyze the changes in barometer measurements over time and compare those to actual weather conditions. They learn how to use a barometer to understand air pressure and predict actual weather changes.

This problem involves the meaning of numbers found on labels. When the level of accuracy is not given we need to make assumptions based on how the information is reported. The goal of the task is to stimulate a conversation about rounding and about how to record numbers with an appropriate level of accuracy, tying in directly to the standard N-Q.3. It is therefore better suited for instruction than for assessment purposes.

This Module discusses how progress monitoring can affect the academic outcomes of students, and it demonstrates how to implement curriculum-based measurement with a classroom of students (est. completion time: 1 hour).

Accuracy of measurement in navigation depends very much on the situation. If a sailor's target is an island 200 km wide, sailing off center by 10 or 20 km is not a major problem. But, if the island were only 1 km wide, it would be missed if off just the smallest bit. Many of the measurements made while navigating involve angles, and a small error in the angle can translate to a much larger error in position when traveling long distances.

Accuracy of measurement in navigation depends very much on the situation. If a sailor's target is an island 200 km wide, sailing off center by 10 or 20 km is not a major problem. But, if the island were only 1 km wide, it would be missed if off just the smallest bit. Many of the measurements made while navigating involve angles, and a small error in the angle can translate to a much larger error in position when traveling long distances.

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.0: Introduction to Measurement:
- YouTube video on introducing measurement
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.1: Calendars - Days of the Week:
- YouTube video on working with calendars - days of the week
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.2: Months of the Year:
- YouTube video on working with a calendar - months of the year
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.3: Measurement - Non-Standard Units:
- YouTube video on using non-standard units in measurement
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.4: Measurement - Non-Standard Units (Estimating Length/Choosing Good Units)
- YouTube video on estimating length and choosing good non-standard units for measurement
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.5: Measurement - Non-Standard Units:
- YouTube video on using 1 copy of a non-standard unit to measure and measuring objects that are not straight
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.6: Measurement - Non-Standard Units (Distance Around):
- YouTube video on measuring the distance around an object using non-standard measurements
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.7: Measurement - Problem Solving:
- YouTube video on problem solving using measurement
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.0: Measurement - Mass:
- YouTube video on using a balance scale to measure mass
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4

Included are the support materials for Grade 2 Blended Learning Math - Unit 4.9: Comparing Mass:
- YouTube video on comparing mass
- Manipulatives and Templates to support Unit 4
- Assessment and Evaluation for Unit 4