AAA Math's interactive tutorials and lessons assist students grades K-8 improve their understanding of a wide range of arithmetic topics. Students are provided with immediate feedback as they complete the "Learn," "Practice," and "Play" portions of each lesson. Browse AAA Math's contents by subject or by grade level.

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.

Choose from a variety of Afterschool Adventures covering multiple subject areas. Each adventure includes a detailed plan, videos, learning games, and book suggestions.

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.

Kindergarteners need a basic understanding of measurement that leads them to know that the smaller the unit the more it takes to measure the same object using less larger units.

Beginning kindergarteners are introduced to science and engineering concepts through questions such as “What is a Scientist?” and “What is an Engineer?”, and go on to compare and contrast the two. They are introduced to five steps of the engineering design process and explore these steps using the “I do, we do, you do” set of guided instruction. At the end of the project, students produce a set of purple popsicles that they design using various materials and by following a set of criteria.

Area word problems using a real world context pose new mathematical challenges for students to negotiate.

1, 2, 3,... Students will demonstrate their counting ability as they count sets of objects between 40-60.

Today you will get an opportunity to conduct an assessment interview that will look at how well your students are measuring with inch tiles.

Do your students know what objects are bigger than a foot? In this lesson, students will need to go beyond memorizing 12 inches in a foot by using that information in measuring larger objects.

Using a broken ruler requires students to turn to addition and subtraction skills in order to determine measurements.

Analyzing the work of others to determine if it meets the criteria for building a nest box.

Expose your students to measurement with this lesson containing four centers. Website includes a lesson plan as well a picture and video to implement the lesson.

Students will be using a hands-on approach to learning about length, capacity and weight.

How do we understand the difference between inches and centimeters? Why does measuring a given object in centimeters always give a bigger number than measuring the same object in inches? This lesson includes detailed plans, printable worksheets, and videos of students engaged in the lesson.

To introduce these terms, students get to learn a little mouse with a LONG name! After reading Chrysanthemum, students look at how long all of their names are and use the terms, "shorter, equal to and longer than" to compare the lengths.

Students will be able to estimate the lengths of objects by mentally partitioning the lengths into inches. A video, worksheets, and a detailed lesson plan are included.

Students will be able to estimate the lengths of objects by mentally partitioning the lengths into inches.

Do students have any idea of what a foot really is? This lesson will have students measuring objects and making predictions about the length of objects.