Tutor in statistics Anne Lawrence says she is delighted to see the event grow from 16 schools last year to 21 this year.
"Last year the students and their teachers clearly enjoyed the challenge of solving our problems.
"There is quite a bit for them to get their heads around in terms of working as a team, deciding how long to struggle with a particular question and, of course, applying their mathematical and statistical thinking to tackle the problems."
Director of the mathematics in industry group at Massey University, Professor Emeritus Graeme Wake, said mathematical skills are applicable now, more than ever.
"Many industry and community problems can benefit from a mathematical or statistical approach.
"Worldwide, countries have discovered that mathematics is a high-tech thing that can add value to their enterprise. Mathematics is everywhere and can underpin everything - this is something not everyone appreciates."