(Images returned from a Wylio search on polyhedra).
Do you or your students ever need images? Care should be taken with copyright when using images from the Internet.
There are many sources of copyright free images. The above images (and many more) were returned as a result of searching Wylio for polyhedron. This Diigo list(clicking on the green links takes you direct to each website) has several sites which can be searched for copyright free images.
Note the end of the list has some sites specific to Mathematics, these are not necessarily copyright free (except those from the Pics4Learning site) but there are many interesting images to show students such as those from the MAA’s ‘Found Math’ project.
A collection of resources to use to demonstrate and practise solving equations.
A simple way to check a solution to an equation of any type is to simply enter your equation as a WolframAlpha query. Note that WolframAlpha includes a graphical illustration; it is so important for students to understand how equations may be solved graphically; I always illustrate graphical solutions when we are working with Algebra to help students make these links. Desmos of course, is ideal here.
The following resources allow practice in choosing the correct operations to reach a solution.
Choose the type of equation you require then the sequence of operations required to solve the equation.
Select Do it after each operation, for example -32 Do it were the keys selected to start the above problem.
The next sites work in a similar way to the subtangent resource.
There are 4 levels to choose from: the level 1 equations are of the type ax = b,
level 2, x±c = d, level 3, ex±f = g and level 4, hx±i = hx±j = k.
Choose the series of operations you require to solve the equation selecting apply at each stage to see the result of your chosen operation.
Choose numbers to add and subtract integers and letters to add and subtract variables.
Unlike the other resources this allows the user to enter the equation resulting from the chosen operation.
The solution is checked at each stage.
As well as solving the given problems (20 problems) the user can select ‘Make an equation yourself’ to enter any equation then solve that equation.
(Unlike the NLVM resource above the x can be any real number).
The following video shows the keystrokes required to enter and solve an equation.