In this challenge, students will be asked to add, subtract, and multiply decimals. Students are give a budget, a price for toothpicks and a price per cm of tape. Then students must create a shopping plan to stay within their budget and a construction plan of how they will use materials. Finally, students carry out their construction plans, and must multiply their point value (also a decimal) by each cm of height they achieve.
In my classroom, I often award critical thinking, exceptional teamwork, or dedication with additional money in the "budget." To increase the challenge, I give some groups the "Buy 12 toothpicks, get 12 half price" coupon.