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• YoucubedFractions Learning Pathways (FLP) By  Dr. Cathy Bruce, Tara Flynn, and Shelley Yearley.

• OAME Abacus

• Gizmos

• Guides to Effective Instruction

• Illuminations

• NRich

• Waterloo - Invitations to Mathematics

• Math Assessment Project

• Unsolved K-12

• Which Would You Rather?

• Open middle

• Real World Math

• 3 Act Math

• Mathematics Task Centre

• Kangaroo Contest

• Caribou Contest

• MOEMS

• Eureka Math (requires setting up a free account)

• Critical Math

• 101qs

• Eureka BasicCurriculum Files 

• Teaching Through Problems Worth Solving (Grade 8)

• Open Middle (K-12): Challenging math problems worth solving

• Fraction Talks

• Peter Liljehdal's Good Problems

• Visual Patterns 

Marian Small's Eyes on Math PDFs

• Pictures for K-2 https://www.tcpress.com/filebin/PDFs/9780807753910_K2.pdf

• Pictures for 3-5  https://www.tcpress.com/filebin/PDFs/9780807753910_35.pdf

• Pictures for 6-8  https://www.tcpress.com/filebin/PDFs/9780807753910_68.pdf