To start with: WHY CONCEPT questions? Because I have found, in teaching secondary students who never learned concepts at lower grades, that throwing concept questions at them requires them to think through what we are discussing--sometimes with no involvement of actually solving a particular problem numerically. In my classes, each student gets a unique quiz at the end of a topic and no one can predict who will get these "concept" questions!
From a database of MORE THAN 42,700 problems and over 1250 skills, a problem type of CONCEPT was used to locate hundreds of questions (51 included here) from grade 3 to HS. They are printed in Grade-Domain-Cluster-Standard-skill-difficulty level order and range from the elementary to challenging. Each is coded with its difficulty level (1= most elementary; 4= most difficult).
Diagrams and/or instructions are oftentimes included when needed by problems. Problems can have extensive answer (and step-by-step solution) sheets (at the end) provided.
Many offerings of more CONCEPT questions are included on this website by grade or by Common Core domain.
[The problems in All WORKSHEETS and PREVIEWS are printed in difficulty (1 [easy], 2 [not so easy], 3 [proficiency] up to 4 [mastery]) order within a skill. The actual difficulty level appears slightly to the left of the DK box of each problem in a very small font. Also, instructional references appear on worksheets but are optional on quizzes.]
COMMENTS, QUESTIONS, CRITICISMS and REQUESTS are REALLY, REALLY welcome.
You might also want to check out the following by GRADE:
the Grade 6 CONCEPT questions
, the Grade 7 CONCEPT questions
and the Grade 8 CONCEPT questions
Also, by DOMAIN: the Domain EE (grades 6-8) CONCEPT questions
, the Domain G (grades k-8) CONCEPT questions
, the Domain MD (grades k-5) CONCEPT questions
the Domain NS (grades 6-8) CONCEPT questions
, the Domains for HS-ALGEBRA (grades 9-11) CONCEPT questions
and the Domains for HS-GEOMETRY (grades 10-11) CONCEPT questions