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.
A pattern recognition game where players must drag the correct shape into the correct spot to complete the pattern.
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.
We visualize complex numbers in the same way we visualize an ordered pair on a plane.
This 4-minute video lesson introduces Khan's series on complex numbers.
This single minute video lesson looks at how to add complex numbers.
This 4-minute video lesson give an example of a complex conjugate.
This 5- minute video lesson shows how to divide complex numbers.
This 4-minute video lesson looks at the imaginary roots of negative numbers.
This 6-minute video lesson explains how to multiply complex numbers.
This 2-minute video lesson explains how to subtract complex numbers.
This short video and interactive assessment activity is designed to give fourth graders an overview of forming figures with cutouts.