Handout
Shmoop

Coordinate Proofs

For Students 8th - 11th Standards
How do you know you know? Prove it! The guide goes through several examples and includes a link to a video to teach learners how to work through coordinate proofs. The goal is to prove that different shapes are indeed that shape. 
Website
Other

Mf P Ltd:the Marketing Mix

For Students 9th - 10th
This page defines marketing mix in an easy to understand format. Contains graphics and dozens of links.
Website
Curated OER

Bized.com: The Marketing Mix

For Students 9th - 10th
A defintion of the marketing mix as the 4P's (price, product, promotion, place). Then it discusses other components such as Market skimming, Market penetration, product-oriented and market-oriented.
Handout
Other

Sukromne Gymnazium: The Study of Economics [Pdf]

For Students 4th - 8th
An introduction to basic concepts in beginning economics.