The problem sets are derived from 20 different skills/topics--at least 2 of which are beyond the Common Core (but typical of curricula before the Common Core's adoption) that deal with number bases.
FOUR worksheets are provided: one with 15 problems per skill; one with 10 per skill; one with 8 per skill and one with 5 per skill. You decide which is best for you.
SEVEN quizzes (all with 20 problems each) are provided: TWO at a level 2 (not too hard); TWO at levels 2 and 3 (harder); TWO at level 3; ONE at levels 3 and 4 (potentially the hardest).
For the most part, these are only for your BEST students.
Further, the Preview has 1 problem from each of the 20 topics.
[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.]
You might also want to check out CONCEPT questions
, LEVEL 4 (challenging) questions
, Grade 8 Summary
, CONSTRUCTION problems
, WORD problems
and STEM problems
for the 8th grade.