Math Strand: Numeration
Making 10 Concentration:
Overview:
This game is a variation of the concentration or memory game. This variation, from the original game, helps strengthen students’ understanding of the Anchor of 10 strategy. To begin place 16 cards face down between players. Players take turns flipping over two cards in an effort to find a match that adds to 10. If the two cards add to 10, the player collects the cards. If the cards don't add to 10, they are turned over again. When a pair of cards are removed, they are replaced with two new cards from the pile. At the end of the game, the player with the most cards wins. The game can also be adapted for the five anchor strategy, the same rules can be used to play Make 5 Concentration, using these cards: aces, 2s, 3s, and 4s.
How this activity supports learning:
Making 10 Concentration provides students with an opportunity to practice making 10. It is important for students to build a foundation of numbers using 10 as an anchor. It is a valuable strategy for computing basic facts and later larger numbers. With a solid anchor of 10 students will see that in 7 + 6 we can find a 10. They would take a 3 from the 6 to join it to the 7 to make 10. The remaining 3 is then joined with the 10 to make 13.
This strategy will later be carried over into multi-digit numbers such as 270 + 360. Students will see that in the 70 and 60 there is 100 with 30 left over. They would then be able to combine 500 + 100 + 30. Essentially, this is "making 10" which is an efficient way to solve computations, especially when doing mental math.
Where to next?
Laying the foundation of learning what makes 10 helps students move towards using up/down over 10 strategy. Look for more activities that support this strategy by looking in the book "What to Look For" page 174 - 184.
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