The focus of this task is on understanding that fractions, in an explicit context, are fractions of a specific whole. In this problem there are three different wholes: the medium pizza, the large pizza, and the two pizzas taken together.

This short video and interactive assessment activity is designed to teach third graders about comparing numbers using greater than and less than.

This short video and interactive assessment activity is designed to teach fourth graders about comparing values of two numbers.

Many students will not know that when comparing two quantities, the percent decrease between the larger and smaller value is not equal to the percent increase between the smaller and larger value. Students would benefit from exploring this phenomenon with a problem that uses smaller values before working on this one.

The purpose of this task is for students to compare a number and its product with other numbers that are greater than and less than one.

This short video and interactive assessment activity is designed to teach second graders about comparing and writing decimal inequalities in word problems.

This short video and interactive assessment activity is designed to teach third graders about comparing the values of numbers to 1,000 - word problems.

In this task students are required to compare numbers that are identified by word names and not just digits. The order of the numbers described in words are intentionally placed in a different order than their base-ten counterparts so that students need to think carefully about the value of the numbers.

In this task students are required to compare numbers that are identified by word names and not just digits. The order of the numbers described in words are intentionally placed in a different order than their base-ten counterparts so that students need to think carefully about the value of the numbers.

An interactive applet and associated web page that demonstrate the concept of complementary angles (angles that add to 90 degrees). The applet shows two angles. You can drag the endpoints of each angle and the other angle changes so that they always add to 90 degrees. They are drawn in such a way that it is visually obvious that together they form a right angle, although they are separate on the page. The angle measure readouts can be turned off for class discussions. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

This short video and interactive assessment activity is designed to teach fourth graders about finding and completing the number patterns.

This short video and interactive assessment activity is designed to teach third graders about finding and completing the number patterns.

This short video and interactive assessment activity is designed to teach fourth graders about completion of number patterns.

This short video and interactive assessment activity is designed to teach fourth graders about completing a decimal place value chart up to hundredths.

This short video and interactive assessment activity is designed to teach fourth graders about completing a decimal place value chart to tenths.

This problem is intended to reinforce the geometric interpretation of distance between complex numbers and midpoints as modulus of the difference and average respectively.

Students learn about complex networks and how to represent them using graphs. They also learn that graph theory is a useful mathematical tool for studying complex networks in diverse applications of science and engineering, such as neural networks in the brain, biochemical reaction networks in cells, communication networks, such as the internet, and social networks. Topics covered include set theory, defining a graph, as well as defining the degree of a node and the degree distribution of a graph.

We visualize complex numbers in the same way we visualize an ordered pair on a plane.

This short video and interactive assessment activity is designed to give fourth graders an overview of forming figures with cutouts.

This short video and interactive assessment activity is designed to teach fourth graders about compound unit multiplication - word problems.