Problems for studying, for learning and for recreation
Many problems can be found on my Twitter account: @mathing. I only tweet math problems or math news items.
Geometry Problems: GoGeometry Problems GoGeometry Open Problems
All Areas: Shell Centre
NRICH weekly problem
NCTM Problems to Ponder
Ohio Resouces' Stella's Stunners
Maths Challenge Problems
Geometry Problems: GoGeometry Problems GoGeometry Open Problems
All Areas: Shell Centre
NRICH weekly problem
NCTM Problems to Ponder
Ohio Resouces' Stella's Stunners
Maths Challenge Problems