This lesson plan is for a 9-10 year old age group and focuses on expressing numbers up to 100 using different patterns and concepts over 60 minutes. The teacher will present numbers up to 20 using odd and even patterns. Students will sing a numbers song and do motions to review numbers 1-20. They will then participate in 5 interactive counting activities including puzzles, drawing numbers, a speaking game, and bingo to reinforce number concepts through cooperation and group work. The teacher will evaluate students throughout based on observation and a worksheet to practice what they learned.