Here is a collection of Desmos graphs, for use as tools for exploration and understanding, or for use in Activity Builder activities. I've categorized them by math topic. I feel the need to emphasize that these are tools, possibly to be used as part of activities, but are not activities themselves. I'll post activities using these tools in Activities, as they come available.
Not for use with students; only for printing number lines on worksheets and such.
Adding Integers on the Number Line
I'm not super happy with either of these for student use (and neither are my students), but I will use them occasionally for adding graphics to something, or for demonstrations.
with divisions and subdivisions. Doesn't do much beyond what you see here, but could be good for including in an activity involving just locating points on number lines.
I think this is my preferred version for making the connections between fractions of objects and fractions represented on number lines. Includes a direction arrow that can be moved from the strip to the line.
Connecting fraction strips and number lines. You can turn either part off. Compare fractions, find common denominators, and more.
Again with the strips and the number line. You can move the arrows down to the number line to see them adding up.
Area Model for Multiplying Fractions
The classic area model. Use sliders in the equation list to change numerators and denominators of fraction factors. Allows fractions to be more than a whole. You'll need to zoom in/out as you change fractions, to get proper framing. I think on my wish list is to turn on some soft "blinking" to emphasize where the whole unit is.
Lots to explore here. Meaning of multiplication (3 groups of 5, or 5 groups of 3), common factors, least common multiples.
Other Visualizations
Fraction Strips
Just three strips that you can divide in three different ways, and one bar to drag. Each strip can be divided with black lines and subdivided with faded lines. Use it to compare fractions, or find common denominators.
Natively shows Base 10, but can also be used to explore other bases.
You can show or hide inner grid to display all of the blocks.
A very simple "Isn't it convenient to count by grouping" model.
Calculator Build Stuff
Probably not of much interest to anyone other than me.
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