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Craig from Brookdale Primary gave this solution:
Perhaps you can find other ways of doing it?
Here is a solution that came in from a pupils in Stage 3 at Burke Ward Primary School, NSW Australia.
Thank you for that extra solution.
During the 2020 lockdown we had this sent in from a teacher who works at Woodmansterne Primary School, she wrote:
One of my newly-returned pupils has found another solution to the problem 'Difference' which we thought you'd like to see! She is called Melissa, and demonstrated excellent resilience with this problem.
Thank you for that, well done Melissa, and thanks to the teacher for submitting it. It's a good solution.
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.