Do you use the NZ Maths website? If not, I would definitely recommend checking it out!
Although its designed for NZ teachers, anyone can access it and it has a ton of amazing ideas and resources for teaching maths.
At the moment, I'm working with a lot of teachers at my school on problem solving, so I've been heading to the problem solving section a lot. There you can find a range of lesson plans around problem solving, sorted by level and strand... soooo handy!
I also LOVE the collection of picture books with mathematical content.... a really comprehensive list of books across the year levels that you can use to support kids maths understanding.
If you haven't had a chance yet, pop on over to www.nzmaths.co.nz when you get a chance.... it's one of those great websites that has awesome resources that you could just pick up and run with... and it's free!