Number Line Addition Game
Visual representations for place value
1st Grade - Love IT!
part-part-whole math (addition/subtraction)
Could do something similar for integrated science and defining the variables for power, velocity etc.
Early learning math center
Sumar con la recta
Lecto Mate Naturales
turkey mixed addition and subtraction
First Grade Math
Butterfly Fractions. Another way how to learn how to add and subtract fractions with unlike denominators.
Math Teaching Resources
Free Printable Math Worksheets