• Recent Interactives

    Divide numbers into two factors, and build arrays to represent each factorization.
    Web Interactive
    Grades: 3rd to 5th, 6th to 8th
    Measurement & Data
    Num & Ops Base Ten
    Algebraic Thinking
    Geometric measurement: understand concepts of area and relate area to multiplication and to addition.
    Use place value understanding and properties of operations to perform multi-digit arithmetic.
    Gain familiarity with factors and multiples.
    4.OA.B.4, 4.NBT.B.5, 3.MD.C.7b
    Explore the amplitude, period, and phase shift by examining the graphs of various trigonometric functions.
    Grades: 9th to 12th, High School
    Trigonometric Functions
    Interpreting Functions
    HSF-IF.C.7e, HSF-TF.B.5

    Count and subitize by playing a game.

    This activity is available for your phone in the Android Market or Apple App Store.  

    Web Interactive
    Grades: Pre K to 2nd
    Measurement & Data
    Counting & Cardinality
    Relate addition and subtraction to length.
    Count to tell the number of objects.
    Know number names and the count sequence.
    K.CC.A.2, K.CC.B.4a, K.CC.B.4b, K.CC.B.4c, K.CC.B.5, 2.MD.B.6
    Create customized activity sheets for your classroom.
    Web Interactive
    Grades: High School, 6th to 8th, 3rd to 5th, PreK to 2nd, 9th to 12th, Pre K to 2nd
    The Number System
    Num & Ops Fractions
    Measurement & Data
    Linear, Quadratic, and Exponential Models
    Use functions to model relationships between quantities.
    Solve real-world and mathematical problems involving area, surface area, and volume.
    Apply and extend previous understandings of numbers to the system of rational numbers.
    Graph points on the coordinate plane to solve real-world and mathematical problems.
    Develop understanding of fractions as numbers.
    Relate addition and subtraction to length.
    Analyze, compare, create, and compose shapes.
    Identify and describe shapes (squares, circles, triangles, rectangles, hexagons, cubes, cones, cylinders, and spheres).
    K.G.A.2, K.G.B.4, 2.MD.B.6, 3.NF.A.2a, 3.NF.A.2b, 5.G.A.1, 6.NS.C.6c, 6.NS.C.7a, 6.G.A.4, 8.F.B.5, HSF-LE.A.1b
    Determine the volume of a box by filling it with cubes, rows of cubes, or layers of cubes. Determine the surface area as well by using the box's net.
    Web Interactive
    Grades: 3rd to 5th
    Measurement & Data
    Geometric measurement: understand concepts of volume and relate volume to multiplication and to addition.
    5.MD.C.3a, 5.MD.C.3b, 5.MD.C.4, 5.MD.C.5a, 5.MD.C.5b
  • Thank you for your interest in NCTM’s Illuminations. Beginning in mid-April, all Illuminations content will be moving here on Interactives will remain openly available, and NCTM members will have access to all Illuminations lessons, which will contain new filtering and search options. We hope you will continue to use and enjoy these resources on