Curated OER
How Many Seeds?
Students write numbers on apple shapes, and then show their understanding of the number's value by putting the corresponding number of seeds on each apple.
Wolfram Research
Wolfram Math World: World's Most Extensive Mathematics Resource
MathWorld provides a huge mathematics encyclopedia detailing the concepts of geometry, algebra, calculus, discrete math, number theory, and other math topics--complete with formulas, diagrams, examples, and references for thorough...
Other
Erikson Institute: Preschool Number Sense Routine Perfect for Transitions
Moving from one activity to another just got a lot more mathematical with this simple routine that builds early number sense with preschoolers. This dot card transition requires only index cards with 1 to 4 dots in various arrangements....
Other
Austin Community College: Mathematical Language
Austin Community College provides a few paragraphs on mathematical language, the importance of learning it, and the importance of using it correctly.
Math Is Fun
Math Is Fun: Comparing, Ordering Decimals
This website gives a simple, easy strategy for how to compare decimals when they have a different number of decimal places. It provides examples in ascending and descending order and an ordering game for practice.