C. Game.
Group 1: Every student picks a number card or wooden or plastic number in figure from 11 to 20. They show their numbers and then make a line in an order from 11 to 20.
Group 2: Every student picks a number card in words. They show their cards and make a line from eleven to twenty. Finally, group-2 members choose their respective numbers from group-1 and make pairs. Continue.......
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