TED Ed videos

BCAMT weekly tasks

Teaching Through Problems Worth Solving – approx. grade 8 level

Open Middle – challenging problems worth solving

Numeracy Tasks from Dr. Peter Liljedahl

Solve My Maths – blog – problems and puzzles

Problems from CEMC (Centre of Education in Mathematics and Computing)

Brainbashers puzzles

Pentomino Information and Problems

Solution for ‘pentomino rectangles’ and some other pentomino puzzles