A - Ten - Tion LEVEL: Grades 1 - 3 SKILLS place value -- numbers to 100 odd/even PLAYERS: 2 or more EQUIPMENT playing cards Ace (=1) through 9 die paper and pencil

• Each player takes two cards from the deck and uses them to create a 2-digit number between 11 and 99. Players say aloud the number they create. Player 1 rolls the die to determine who will win 10 points for the round.

• If the die lands on an odd number (1, 3, 5), the player who created the lower 2-digit number wins 10 points.
• If the die lands on an even number (2, 4, 6), the player who created the higher 2-digit number wins 10 points.
• Players continue building numbers and alternating the roll of the die. The first player to accumulate 100 points is the winner.

FOR AN ADDED CHALLENGE:

Two dice may be used; add them together before determining if the roll is odd or even.

Additional Modifications Generated at PD and Popcorn:

Use your 2-digit number and find its factor family or all of its prime factors.

Determine if your 2-digit number is prime.

Create 1-digit numbers to determine factors and whether the number is prime.

To determine the winner with the die, make the rule that if Player 1 rolls an odd number, the person with the most prime factors wins 10 points. If the die lands on an even number, the person with the least prime factors wins 10 points. The player who accumulates 100 points is the winner.