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We received this solution from someone who didn't give their name:
Lachlan is 3
David is 7
C is 12
I first looked at the ones with Cassandra in and found the difference, which was 4, so that means David and Lachlan's ages have a difference of 4. I then worked out that 7 and 3 have a difference of 4 and make 10. So, either David is 7 and Lachlan is 3 or the other way round.
When I took 7 from 19 to get Cassandra's age, that made 12 and it also made 12 if I took 3 from 15, so it must be that way round.
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.