Engaging starter time!
Use 4 pieces of paper with the numbers 1, 2, 4 & 8. Four people, one foot, make me the numbers from one to fifteen, go.
What's the highest number you can make using addition?
What's the highest using multiplication?
What numbers can't you make?
Can you make 27 using a subtraction?
Only using 5 feet, make 18 using mult/div/add/sub/all.
Doesn't need to be complicated. Keep it simple, sweetheart.
Convince us which is the best.