
PreK – Grade 12
Change the number of
sectors and increase or decrease their size to create any type of
spinner. Then, conduct a probability experiment by spinning the spinner
many times. How does the experimental probability compare with the
theoretical probability? 

PreK – Grade 12
This
tool allows you to learn about various geometric solids and their
properties. You can manipulate and color each shape to explore the
number of faces, edges, and vertices, and you can also use this tool to
investigate the following question: For any polyhedron, what is the
relationship between the number of faces, vertices, and edges? What
other questions can this tool help you answer? 

PreK – Grade 2
Thinking about numbers
using frames of 5 can be a helpful way to learn basic number facts. The
four games that can be played with this applet help to develop counting
and addition skills.


PreK – Grade 2
Thinking about numbers using frames of 10 can be a
helpful want to learn basic number facts. The four games that can be
played with this applet help to develop counting and addition skills. 

PreK – Grade 2
Oh, no! Okta and his friends need help. Help rescue them
by transporting them to a safe ocean. How fast can you transport the
Oktas? Use your counting skills to save as many as you can before the
timer runs out! 

PreK – Grade 2
Help the
alien spaceship move cows into corrals by counting, adding, and
subtracting. This activity helps children learn grouping, tally marks,
and place value. As they mast counting, they can move on to adding and
subtracting twodigit numbers.


PreK – Grade 2
This twopart eexample encourages students to use
visualization, spatial reasoning, and geometric modeling to build their own
patterns or recreate one from given square arrays. 

PreK – Grade 12
Need
a pentagonal pyramid that's six inches tall? Or a number line that goes
from 18 to 32 by 5's? You can create all those things and more with
this interactive. Export your finished paper as a PDF activity sheet for
your students or as a JPG image for use in other applications, such as
the web.


PreK – Grade 5
Learn how to count, collect, exchange, and make change
for coins. The coin tiles help you count as you learn the value of each
coin. How many of the games can you master? 

PreK – Grade 5
Bobbie Bear is planning a vacation and wants to know how many outfits can be made using different colored shirts and pants. 

PreK – Grade 5
By yourself, or against a friend, match whole numbers,
shapes, fractions, or multiplication facts to equivalent
representations. Practice with the clear panes or step up the challenge
with the windows closed. How many socks can you win? 

PreK – Grade 5
Use this tool to design a pattern using geometric shapes.


PreK – Grade 8
This tool allows you to create any geometric shape imaginable. Shapes can be created, colored, enlarged, shrunk, rotated, reflection, sliced, and glued together.


Grades 3–5
Use this
applet to determine the volume of a box by filling it with cubes, rows
of cubes, or layers of cubes. Also, determine the surface area by using
the box's net.


Grades 3–8
Build up to algebraic thinking by exploring this balance tool using shapes of unknown weight. Challenge yourself to find the weight of each shape in one of six builtin sets or a random set. 

Grades 3–8
Use this tool to strengthen understanding and computation
of numerical expressions and equality. In understanding equality, one
of the first things students must realize is that equality is a
relationship, not an operation. Many students view "=" as "find the
answer." For these students, it is difficult to understand equations
such as 11=4+7 or 3×5=17–2. 

Grades 3–8
Love the Factor Game? You can play against other players from all over the world at Calculation Nation^{TM}, and online world of math strategy games. Create an account, log in, and challenge an opponent to Factor Dazzle!


Grades 3–8
The Product Game is a fun, interactive game that exercises your skill with factors and multiples. 

Grades 3–8
A net
is a twodimensional figure that can be folded into a threedimensional
object. Determine which nets will form a cube in this interactive.


Grades 3–8
This
applet allows students to individually practice working with
relationship among fractions and ways of combining fractions. For a two
person version of this applet, search for the Fraction Track EExample
at nctm.org.


Grades 3–8
Use this applet to create patterns to cover the screen using regular polygons.


Grades 3–12
This interactive pan
balance allows numeric or algebraic expressions to be entered and
compared. You can "weigh" the expressions you want to compare by
entering them on either side of the balance. Using this interactive
tool, you can practice arithmetic and algebraic skills, and investigate
the important concept of equivalence. 

Grades 3–12
Use this
interactive tool to create dynamic drawings on isometric dot paper. Draw
figures using edges, faces, or cubes. You can shift, rotate, color,
decompose, and view in 2D or 3D.


Grades 6–8
Explore different representations for
fractions including improper fractions, mixed numbers, decimals, and
percentages. Additionally, there are length, area, region, and set
models. 

Grades 6–8
Divide numbers into two factors and build arrays to represent each factorization. 

Grades 6–12
This
activity allows the user to enter a set of data, plot the data on a
coordinate grid, and determine the equation for a line of best fit.


Grades 9–12
Explore amplitude, period, and phase shift by examining the graphs of various trigonometric functions.


Grades 9–12
Explore both radians and degrees (or a combination of both) to hit Okta, the octopus.
