Materials:

Playing Cards (Ace = 1 through 9), game mat

Set Up and Play:

This is a great math card game. Players divide the deck of cards evenly amongst themselves. Each player takes two cards and places them, face down, on the game mat (one card in each column).

Each player turns over the two cards to make a 2 digit number. Both players call out their numbers while verbalizing it (i.e. Three tens and four ones equals 34). The player with the largest number takes all four cards.

If there is a draw (both players have the same number), war is declared. Each player takes two more cards, place them on the Game Mat, and adds that second number to the first number (the one they tied with). The player with the largest sum takes all 8 cards.

The game ends when one player has all of the cards.

from:

http://www.primary-education-oasis.com/math-games-for-kids.html#.UfN8MmS9XU4

Decimal Variation:

Create a mat that includes a decimal and tenths and hundredths columns.

Red cards = Decimal values

Black cards= Whole number values

Each student should place their cards on the mat to create a number and say their number out loud to their partner to practice reading decimal numbers. The two numbers should then be compared and the larger number takes the cards for that round.

Example:

If a student draws a black 3 and a red 5, their number would be 3.5 so they would place their cards in the correct place on the mat and say, "three and five tenths".

If their partner draws a red 7 and a red 2, they may choose to play it as either .72 or .27. They should place their cards on the mat and state their number orally.

Comparing the two students' numbers, the 3.5 is larger, so the first student would win the cards.