Maths lends itself to an inquiry approach. An inquiry approach also works well with collaborative groups of learners.
Jo Boaler - YouCubed
Real Messy Maths - presentation with lots of maths problems to solve
The Mathematics Shed - heaps of maths problems and activities to use as a springboard for inquiry
5 Websites that support an inquiry approach to maths
Get the Math - algebra in the real world
NRich site - rich maths problems and activities
Math Class Needs a Makeover - Dan Meyer - children should be formulating problems not just solving them.
Inquiry Maths 2
Maths by Inquiry
Example Inquiries to adapt
Predict the Winner of the Rugby World Cup - could be adapted for any sporting event and uses analysis of statistics to inform decision-making