University of Cambridge
University of Cambridge: Maths and Sports: The Games' Medals
Who could have won the gold, silver and bronze medals? This activity is designed to be accessible to primary pupils at Key Stage 1.
CK-12 Foundation
Ck 12: Elem Math: Selecting the Greatest Value
[Free Registration/Login may be required to access all resource tools.] A learning module where students must look at four number sentences with the same numbers and operations signs but different placement of parentheses, and follow the...
Alabama Learning Exchange
Alex: A Math and Language Arts Lesson: Division
The lesson will help students develop an initial understanding of division and clarify how the four operations of addition, subtraction, multiplication, and division relate to and are separate from each other. The lesson begins with a...
Khan Academy
Khan Academy: 2 Step Word Problems
Solve two-step word problems with addition, subtraction, multiplication, and division. Some questions include estimation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive...
Math Playground
Math Playground: Make a Number
Make the target number using four cards and four operations in this interactive game.
Teaching Treasures Publications
Teaching Treasures: Year Four Math (Page 1)
This interactive worksheet combines all four operations. The focus is on addition and subtraction fact through one hundred and basic multiplication and division facts. This easy to navigate activity offers learners immediate feedback and...
Teaching Treasures Publications
Teaching Treasures: Year Four Math (Page 2)
This interactive worksheet combines all four operations. The focus is on three-digit addition and subtraction and basic multiplication and division facts. This easy to navigate activity offers learners immediate feedback and would be...
Thomas Jefferson National Accelerator Facility
Jefferson Lab: Speed Math Deluxe
The goal of SpeedMath Deluxe is to create an equation, as quickly as possible, from the four digits the computer gives you. You can use addition, subtraction, multiplication and division to create your equation, but you are not allowed...
AAA Math
Aaa Math: Addition Properties
Learn the definitions and study examples of the four properties of addition. Then try the game to check your understanding of each of the properties. The game will tell you when your answers are correct. If you answer incorrectly, it...
Other
Kid's Page Archive: Free Printable Math Worksheets
Great source for math worksheets on all four whole number operations, fractions, and miscellaneous arithmetic topics. Could be used to assess basic arithmetic skills for areas that need remediation.
Shodor Education Foundation
Shodor Interactivate: Arithmetic Four
Students try to connect four game pieces in a row by answering whole number and integer problems. They can choose the difficulty level as well as addition, subtraction, multiplication, or division.
Wikimedia
Wikipedia: Las Cuatro Operaciones Basicas
In Spanish. encyclopedic explanations of the four basic operations. Also linked to other information on arithmetic.
CK-12 Foundation
Ck 12: Elem Math: Solving Money Problems Involving Four Operations Using a Table
[Free Registration/Login may be required to access all resource tools.] In this learning module, students solve word problems involving money where some of the information is presented in a table. An accompanying video demonstrates how...
CK-12 Foundation
Braingenie: Multi Step Word Problems in Four Operations With Compound Units
[Free Registration/Login may be required to access all resource tools.] Braingenie builds mastery and sharpens problem-solving skills. Students can learn, practice, and quiz themselves on thousands of skills in the areas of math and...
CK-12 Foundation
Ck 12: Elem Math: Adding and Subtracting With Parentheses
[Free Registration/Login may be required to access all resource tools.] The resource includes a video tutorial on how to find a missing number in a multi-operational problem by working backwards. The video is followed by practice...
CK-12 Foundation
Ck 12: Elem Math: Determining Task Length
[Free Registration/Login may be required to access all resource tools.] For this learning module, students solve word problems where they must calculate the length of time a task takes. Includes video demonstrating a sample problem and a...
University of Cambridge
University of Cambridge: Maths and Sports: Olympic Logic
Four sporty brainteasers in the context of fencing, hockey, football and international medal tables. This activity challenges students to be resourceful, to think logically and to work systematically, and is designed to be accessible to...
CK-12 Foundation
Ck 12: Elem Math: Time Challenge Word Problems
[Free Registration/Login may be required to access all resource tools.] In this learning module, students must solve word problems involving elapsed time. The process is demonstrated in the accompanying video. [1:41] A set of practice...
AAA Math
Aaa Math: Properties of Addition
Explains the four mathematic properties of addition. Gives exercises and games to practice this skill.
Other
Chili Math: Basic Number Properties
Overview of the four basic number properties with examples.
Shodor Education Foundation
Shodor Interactivate: Arithmetic Four
You can challenge a friend to play this game to practice your arithmetic skills. Be ready because any kind of problem can pop up. You can adjust the problems to make them harder and also to give you less time.
Varsity Tutors 
Varsity Tutors: Aplus Math: Flashcard Creator
Create and print your own flashcards to practice your basic math facts. Choose either addition, subtraction, multiplication, or division, as well as which sets of numbers you would like to practice. The flashcards come in sets of twelve,...
Varsity Tutors 
Varsity Tutors: Aplus Math: Flashcard Creator
Create and print your own flashcards to practice your basic math facts. Choose either addition, subtraction, multiplication, or division, as well as which sets of numbers you would like to practice. The flashcards come in sets of twelve,...
PBS
Wnet: Thirteen: Get the Math
On this site, students can explore real-world applications of algebra concepts in music, fashion, and video games. It provides comprehensive lesson plans, video clips, and interactive challenges for students.