How Many Under the ShellInvestigations Recommended for Grades: K, 1Players choose a number of shells to play with. The game counts out the shells and then an octopus hides some. The game counts how many are showing, and players use that information to determine how many are hidden.

Save the WhaleInvestigations Recommended for Grades: K, 1, 2, 3Given two labeled pipes of 10, side by side, the player has to complete the partially filled in one (e.g. if it has 6 links, the player needs to drag the one with 4 links up) to save the whale.

Flight 4 FuelInvestigations Recommended for Grades: K, 1
This videogamelike game provides practice with addition of two or more addends. Players try to collect an exact amount of fuel (e.g. 11) by gathering bits at a time (+4, +3, etc.) without going over.

Math Lines Add to 10Investigations Recommended for Grades: K, 1, 2, 3The player needs to shoot a ball labeled with a number 110. If it hits the number that sums with it to make 10, both balls disappear (i.e. try to shoot the 7 so that it hits a 3).

Math Lines Add to 20Recommended for Grades: 1, 2, 3
Shoot the numbered balls in the snaking line, so that they add up to 20. If you shoot two adjacent balls of the correct number, they will both disappear.

Ghost BlasterInvestigations Recommended for Grades: K, 1, 2, 3Videogamelike practice with 2addend combinations of any number up to 99. The players choose a target number and then try to be the first to click when they see two ghosts (labeled with numbers) that equal the target number. K1 students will benefit from playing with numbers to 10 or so. (From Oswego City School District.)

Techno TortoiseInvestigations Recommended for Grades: 2, 3Players direct a turtle on a number line to solve a given addition problem making only jumps of +10, +5, and +/ 1.

PowerlinesInvestigations Recommended for Grades: 2, 3, 4, 5Students are presented with a gameboard and several sequential numbers. They are asked to place the numbers in positions such that each line is equal to the total that is displayed on the bottom of the page.

Close To...Investigations Recommended for Grades: 4, 5Players use 4 of 6 (or 6 of 8) digit cards to make a sum as close as possible to 20 (or 100 or 1000) as they can. A player's score is the distance the sum is from the target number. Players play against the computer.

Circle 21Investigations Recommended for Grades: 2, 3, 4, 5In order to complete the puzzle, each circle must add up to 21, using all of the numbers. When a circle is completed correctly, it changes color.

Circle 99Investigations Recommended for Grades: 4, 5In order to complete the puzzle, each circle must add up to 99, using all of the numbers. When a circle is completed correctly, it changes color.

Speed Grid Challenge
Investigations Recommended for Grades: 2, 3
Subtraction. Players click on two numbers that make the equation below the grid true. (e.g. __  __ = 27). Players decide how many problems they want to solve in how many minutes.
Subtraction ActionInvestigations Recommended for Grades: 2, 3Players choose a string of single digit numbers from a large board of the numbers 09, that when subtracted from the given amount, equal the given total. (50  ? – 17)

Add It UpInvestigations Recommended for Grades: 2, 3 
Alien Addition (Arcademic)Investigations Recommended for Grades: 2, 3Players are given a total and must shoot a space ship whose expression equals that total. Players can set the range of the content and the speed at which they'd like to play: slow, normal, or fast. At the end of the game, statistics are provided, including information about errors.

Number EatersInvestigations Recommended for Grades: 2, 3The player directs a monster around a board, making it eat only the expressions that equal the target number.

Sum Sense AdditionInvestigations Recommended for Grades: 2, 3Given 3 or 4 cards (e.g. 6 9 5 1) and an empty expression (_ + _ = _), make a mathematically correct equation (e.g. 9+6=15). Players can set the number of questions and the amount of time. (From Oswego City School District.)

Sum Sense SubtractionInvestigations Recommended for Grades: 2, 3Given 3 or 4 cards (e.g. 5 1 6) and an empty expression (_  _ = _) make a mathematically correct equation (e.g. 65=1). Players can set the number of questions and the amount of time. (From Oswego City School District.)

Addition and Subtraction GameInvestigations Recommended for Grades: 2, 3Players begin with a board full of the numbers 09. They try to clear as much of the board as possible in the time allotted by correctly choosing numbers that make the equations that appear beneath the board (e.g. __  __ = 4 or __ + __ = 9) true.

Jet Ski (Arcademic)Investigations Recommended for Grades: 2, 3Videogamelike practice of the addition combinations. A problem is posed, and the player has to click on the correct answer (of 3 choices) to get the jetski to drive faster and win the race. After, the game provides statistics including information about errors. Up to 4 players.

Tugboat Addition (Arcademics)Recommended for Grades: 1, 2, 3
Tugboat Addition is a multiplayer math game that allows students from anywhere in the world to play tug of war with each other while practicing their addition facts! Addition facts to 12. Up to 8 players.

Kitten Match (Arcademics)Recommended for Grades: 1, 2, 3
Kitten Match is a multiplayer math game that allows students from anywhere in the world to compete against each other while practicing addition! Up to 4 players.

Home Run Derby MathInvestigations Recommended for Grades: 4, 5Students choose an operation (addition, subtraction, or multiplication), estimate the answer to a math problem presented on a baseball scoreboard, and then click "hit". The closer the estimate, the farther the baseball player hits the ball. Note that using a comma in one's answer results in a strike.

Adding Two DiceA TESiboard activity to practice doubling and adding (to 10 or 12), with two dice. Choose on the options screen whether to play against a timer (able to select 1 minute, 2 minutes, 3 minutes or unlimited).
Click here for numbers version of the same game. 
Addition PyramidAdd the two pairs of numbers in the bottom level to fill the gaps in the middle level. Add the numbers in the middle level to find the number at the top. Then check your score. Get 1000 mummy points to open the Mummy's tomb!" Customizable: easy, medium, hard.

Addition Stories  number bonds to 5 and 10Ask students to add the groups of objects together by counting as they drag them into the totals box.

Alien Pairs to 5A simple warmup game using number bonds. Find all the pairs that add up to 5 as quickly as possible. Drag a pair of aliens into the beam and press 'check'. If the combination is correct, the ship will zoom off and another empty ship will appear.

Alien Pairs to 10A simple warmup game using number bonds. Find all the pairs that add up to 10 as quickly as possible. Drag a pair of aliens into the beam and press 'check'. If the combination is correct, the ship will zoom off and another empty ship will appear.

2 Digit Learning Subtraction

Fruit Splat SubtractionChoose your level. Level 5 and 7 including subtraction with regrouping.

Mr. Nussbaum Drag and Drop MathChoose addition, subtraction, multiplication, and division. Great for practicing how to regroup. Watch a movie on how to play and then click on "Click here to try this" to play the game.

Island Chase (Arcademic)Investigations Recommended for Grades: 2, 3Videogamelike practice of the subtraction facts. A problem is posed, and the player has to click on the correct answer (of 3 choices) to get the jetski to drive faster and win the race. After, the game provides statistics including information about errors.

Minus Mission (Arcademic)Investigations Recommended for Grades: 2, 3Players are given a difference and must shoot a green blob whose expression equals that number. Players can set the range of the content and the speed at which they'd like to play: slow, normal, or fast. At the end of the game, statistics are provided, including information about errors.

Math BasketballTwo digits with regrouping

3 Digit Subtraction 