These two group activities use mathematical reasoning - one is
numerical, one geometric.
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.
Katie had a pack of twenty cards numbered from $1$ to $20$.
She arranged the cards into six unequal piles.
The numbers on the cards in each pile added to the same total.
What was the total and how could this be done?