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Odd/Even Dice Subtraction (Subtraction Game) April 13, 2009

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●Three dice, pencils and paper.

Two playersstart the game with 200 points each at the top of their paper.  They take turns rolling the three dice.  One player will be the ODD player, and one will be the EVEN player.  Each time the sum of the dice rolled is EVEN, the EVEN player subtracts that number from his running total.  If the sum is ODD, ODD player gets to subtract it.  First player to get rid of all his points, wins.

Variation: You can do this the same way with addition.  Just start at 0 and go up to 200.

Take Offs and Landings (Addition/Subtraction Game) April 12, 2009

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●Each player needs paper, pencil and two dice.

Take Off is played by pretending you are an airplane trying to reach 100 feet in altitude.  Taking turns, each player rolls his dice and adds them together and writes this number down.  His plane is now at that altitude.  The next player does the same.  The first person to get closest to 100 or reach it exactly, wins.

Landings is the same game, except now your airplane is at 100 feet and is coming in for a landing at ground zero.  Each player rolls his dice and subtracts that from 100.  Play continues until someone comes closest to zero or reaches it exactly.  Any player that goes past 0 will have crashed.

Subtraction Slapjack (Subtraction Game) April 12, 2009

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●4 to 6 sets of cards from 1-9 or 1-13.

Deal cards equally to players. Everyone keeps their deck face down in front of them. A target number is chosen before each round of play. For example, the target number is three. Players then start by turning their top card over and whenever a difference of 3 is spotted, that person slaps their card in front of them and names which cards, when subtracted, equal 3. He then wins all cards in play and puts them at the bottom of his face-down deck. Whoever gets all the cards wins, or the player with the most card when time is called, wins.

Four Number Constant (Subtraction Game) April 11, 2009

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● piece of paper for each team or whiteboard/chalkboard

Player or team selects any four numbers from 1-15 and writes them across his paper to form the beginning of four columns.  Proceed to take the first two numbers across, subtract the smaller number from the larger one, and put that answer under the first column.  Then take the numbers from columns 2 and 3 and subtract and put that answer under the second column.  When you get to the fourth number, use the number in the first column to subtract and get an answer.   Put that answer in the fourth colmn.  Continue this pattern in each row until all numbers are the same.  First player or team to do this, wins a point.  Teams could start with the same numbers and race each other, or use different numbers.  For example, if you wrote a 7,2,4 and 13 across the top, the next row would be as follows: 7-2 = 5, 4-2=2, 13-4=9, and 13-7=6.

7    2    4    13
5    2    9    6
3    7    3    1
4    4    2    2
0    2    0    2
2    2    2    2

Subtraction Dice War (Subtraction Game) April 11, 2009

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●Three dice for each player – 2 of one color and one of another color.

On each round, players roll their dice simultaneously and add two of the dice of the same color and subtract the dice of the other color.  Player with the highest correct answer wins a point.  First one to 10 points wins the game.

Number Families (Addition/Subtraction Game) April 11, 2009

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● 4-6 sets of cards numbered 1-12.

Each game starts with declaring a particular number family that will be in play, such as 12 or 7. Dealer shuffles cards and deals them equally to all players. Players may not look at their cards, but must place them face down in a pile in front of them. Players in turn place their top card face up on the table. The first person to spot the face-up cards taht when added or subtracted equal the number family, slaps his face up card and names the cards that belong, such as a 3 card, a 5 card and a 4 card make the number family 12. If he is correct, he wins all the cards in that family and puts them in a separate pile. Game continues until all cards have been played. Player that has the most family cards wins.

Eleven Card Turnover (Addition/Subtraction Game) April 10, 2009

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● two dice
● Each player needs a set of cards numbered 0 to 10.

Place all the cards face up in a row in front of each player.  First player rolls two dice on his turn and may choose to add or subtract the two numbers shown on the dice.  If the answer equals one of the cards face up, the player may turn it over.  The next player does the same.  Play continues until someone gets all 11 cards face down.  This also can be played as a solitaire game.

Addition Bingo (Addition/Subtraction Game) April 10, 2009

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●Two dice
●beans or bingo chips
● Bingo cards – make a grid that is four rows by four columns (16 squares total.)  Write the digits 2 through 12 randomly on each of the squares.  There will be four extra squares so you can put in duplicates of any of these numbers.
Leader rolls the two dice.  Whatever the sum of the dice is, players must mark that answer on the card.  First to get four in a row wins the round.

Foolish Math (Addition/Subtraction Game) April 10, 2009

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●Whiteboard, poster or large piece of paper with the following written on it:

0 – open mouth wide

1 – stand on one leg

2 – two hands on knees

3 – two arms and one leg up

4 – down on all fours

5 – fingers in ears

6 – finger on nose

7 – hand on top of head

8  – jump up and down

9  – sit in a chair

10 – lie on the floor

11 – spin around

12 – start singing

13 – stick tongue out

14 – whistle a few notes

15 – start clapping

Players take turns being the leader, who acts out an addition/subtraction problem. For example, to act out 4+ 8, the leader would get down on all fours and then stand up and jump up and down. The first player to perform the correct action that corresponds to the answer is the winner. In this case, 4+8=12, so the winner would have to start singing.

Twenty One (Addition/Subtraction Game) April 9, 2009

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●4 to 6 sets of 0-11 cards.

Shuffle cards and deal one card face-down and one card face-up to each player.   Players may not look at their face-down cards until the end of the play.  The object of the game is to get a total of 21 (but not over 21) in the face-up stack.   The leader asks each player if they want another card face-up on their stack, but the player also needs to take into account that they don’t know what the value of the face-down card is, which will be added to the stack after they tell the leader to stop adding face-up cards.  When everyone has decided to stop, everyone looks at their cards to see who is closest to 21 without going over.  They win all the cards in play.  If there is a tie, each person gets half the cards.    For example, if you have a 2 in your face-up stack, you would probably want to ask for another card in that stack, since the highest you could have face-down would be 11 for a total of 13.  So say you ask for another card and you get a 5.  Then you tell the leader you don’t want any more cards.  When everyone counts their cards, you would add 2 plus 5 plus the face down card which just happened to be an 11, and you’d get 18.