## Wednesday, August 3, 2011

### Easy New Number Sense Card Game: 123 Switch!

Here's another new card game you can use to quick and easily practice adding and subtracting positive and negative integers.  I've dubbed it 123 Switch, and you'll see why in a moment:

You'll need: a deck of cards for each group of 2-4 players, the DIY graphic organizer seen above, and paper for each student to write down (and double check) every simple number sentence that's created.

As with many of the other games I've shared, black cards represent positive integers and red cards represent negativesAces are ones and all other face cards are tens.
1. Each player gets 7 cards.  The remaining cards are a draw pile.
2. For the first turn, the player must create a correct number sentence in the form A + B = C (for example, 6 + (-8) = -2, as in the photo above)
3. For all subsequent turns, players can replace one, two or all three cards to create a correct number sentence.  They should stack the cards on top of each other (so there's always three showing).
4. As in Uno, each player must put down at least one card per turn.  If they can't do so with the cards in their hand, they have to draw cards until they can put down something.
5. The objective is to be the first player to get rid of all of your cards.
Let's say it's my turn to continue the example above, and my hand is the one on the left.  I would have the option of playing one, two or three cards:

One card: Replace just the -8 with my own -8.

Two cards: Replace the 6 and -8 with -6 and 4, which still equals -2.  I could also leave the 6, replace the -8 with 4, and the -2 with 10 (6 + 4 = 10).

Three cards: I could replace all three cards with -6 + 10 = 4

As they play, students should write down every number sentence that's made, and should be encouraged to police each other closely (with your help, of course).  Every group will have had different practice, and can proceed at their own speed.  That would make this quality independent practice for your lesson on this concept.