Kindergarten Computation and Algebraic Thinking Resources
Explore notions of equality and inequality by dragging expressions to the balance. Select whether you'd like your inequalities recorded with the "not equal" sign (≠) or greater/less than signs (> and <).
This activity is meant to develop flexible, creative thinking about numbers and operations. Your goal is to move a from a starting number to a target number, but there are many ways to do this! Adjust the sliders to control the bounds of the numbers involved.
How many dots are there? How do you see it? This number talk resource is designed to give students lots of different ways of seeing and describing a number of dots, but with the added advantage of seeing the dots move from one arrangement to another. Use this with the goal of students flexibly describing many ways of composing/decomposing a number.
Designed to develop ability to estimate reasonable answers in subtraction situations. Specify your own subtraction problem (or generate a random one), then represent the relative size of the subtrahend by shading a rectangle representing the minuend. Feedback on accuracy of shading is provided. (Not included but recommended: finish by estimate the size of the difference before actually doing the subtraction.)
A set of three related applets (addition, subtraction, and both) taken from the game "Racing Bears" in Math Fact Fluency by Jennifer Bay-Williams and Gina Kling. This version was designed for students who are learning remotely and intended to be used along with GeoGebra Classroom (the "Create Class" button at the top right of the page) to allow teachers to monitor students' work. The small checkbox at the right of the applet displays how many right and wrong moves the students has made.