We recently have linked RRSA articles to some fantastic displays that we have kept, as we find XC links more valuable and children are able to see maths in a real life context. We have taken a range of photos from EYFS to Year 6 of maths in our school and put them on canvases and placed them around our school. We have WW walls and HOT boards. In our HOT boards whcih ca quickly be changed if necessary as they are just perspex plastic like photo frames we have quotes from mathematicians and fibonnacci spirals etc displayed.
TTS have some great board games and one we love at our school is 24 (mathzone or amazon), there is a lunch time club linked to it too. It isn't a board game rather than solving a puzzle. Dominoes are always great and Twinkl premium also have lots to print off and laminate.