Activity
Other

Art of Math: Making Math Fun

For Students Pre-K - 1st Standards
This site offers customizable math challenges to help students master their math facts. Options include skill, age, and difficulty level as well as number of problems.
Professional Doc
Books in the Classroom

Carol Hurst's Children's Literature Site: Computation and Picture Books

For Teachers Pre-K - 1st Standards
This sample chapter from Hurst's book Picturing Math is an excellent resource for using picture books and activities for learning computation.
Interactive
Doina Popovici

Math Play: Balance the Addition Equation Math Racing Game

For Students K - 1st
Use your quick thinking and addition math skills to play this math racing game.
Unknown Type
Math Aids

Math Aids: Addition Worksheets

For Teachers K - 1st
Great resource to practice and strengthen math skills pertaining to addition. Math worksheets are printable, may be customized, and include answer keys.
Lesson Plan
Discovery Education

Discovery Education: Everyday Math

For Teachers 1st - 5th Standards
Students will work as a class to solve word problems involving addition, subtraction, multiplication, and simple fractions. To culminate the instructional activity, students will create their own word problems.
Activity
Cool Math

Coolmath: Coolmath4kids: Printable Flash Cards

For Students K - 1st
Find here flashcards for addition, subtraction, multiplication, and division for printing off and coloring.
Interactive
Arcademics

Arcademics: Canoe Puppies

For Students Pre-K - 1st
Canoe Puppies is a multiplayer math game that allows students from anywhere in the world to race against each other while practicing adding two-digit numbers!
Unit Plan
AAA Math

Aaa Math: Two Digit Addition Equations

For Students 2nd - 3rd Standards
Learn how to solve two-digit addition problems, and then practice the skill with interactive problems.