The following “demos” are available on a trial basis. If you have any suggestions for improvement, please email paul@schoolsnapshots.org
Grade 1: Add old and new soccer balls to get 20
The soccer coach has a bag with a lot of soccer balls in it, but some of them are old. She wants to know how many new soccer balls she has for use in today’s soccer match. Use the sliders below to find out how many soccer balls she can use. Link
Grade 2: Geometry, Common Core
Grade 2 Mathematics, Common Core, says, “Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.” This demo allows students to manipulate a small rectangle (max size 5 by 5 units) on a grid and count the squares inside to determine the area. The word “area” is not used at this level, but to make it more interesting, the student’s rectangle will change to a random color every time they move the pegs on the peg board. Link
Grade 6: Use a Peg Board to Make Quadrilaterals
Don’t spend another dime on replacement GeoBoards: We’ve got one online that will never break and gives immediate feedback to students about the shapes they’ve made. This toy peg board is useful for helping students (and their parents) visualize everything from identification of various types of quadrilaterals to using the Pythagorean Theorem to find the distance along a right triangle’s hypotenuse. Just let students explore and discover the relationships by manipulating the vertices of a general quadrilateral. Types identified include the square, rhombus, parallelogram, rectangle, kite, trapezoid, concave, and bow-tie quadrilaterals. Link
Rational Numbers (Grade 4-7)
This brief demonstration allows you to select two whole numbers and see the decimal approximation for the quotient of the two whole numbers selected using slider controls. It illustrates that every rational number that can be represented as the quotient of two integers has a repeating or terminating decimal part. Link
Grade 6+: Least Common Multiple on Number Lines
This tool will provide the least common multiple for up to four whole numbers, 1 to 20. The Common Core mathematics curriculum standard provides for sixth graders finding the least common multiple for only two whole numbers, 1 to 12, but we have decided to be a little more challenging. In addition to the least common multiple, we also show the complete prime factorization for each of the whole numbers entered, considered to be a step in one of the most efficient ways to find the least common multiple. We also plot the multiples of each number up to about 100. Link
Grade 6+: Greatest Common Factor on Number Lines
This tool will provide the greatest common factor for up to four whole numbers, 1 to 100. The Common Core mathematics curriculum standard provides for sixth graders finding the greatest common factor for only two whole numbers, but we have decided to be a little more challenging. In addition to showing the list of whole number divisors for each number, we also plot those factors on four number lines stacked on top of each other. Link
