Number Line Addition Game
Kindergarten - addition
Snag this addition freebie! "Build it" cards have students practicing addition within 20 and showing their answers.
ways to make numbers
Good quiet activity for addition, subtraction, multiplication, or division.
Activities for education
Butterfly Fractions. Another way how to learn how to add and subtract fractions with unlike denominators.
Math Teaching Resources
Rainbow to 10 anchor chart. Great for students learning addition. Also would be great for teaching addition of integers.
Hands on addition with number line. This could be adapted for second grade by using base ten blocks in the circles and an open number line.
Could do something similar for integrated science and defining the variables for power, velocity etc.
Off the Grid: Addition and Subtraction Game