Included are 3 topics:
1. Eratosthenes' Sieve
2. Euclid's method of finding the GCF of 2 numbers
3. Egyptian fractions
All three of these have been employed historically for practical and conceptual reasons.
[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 the Grade 8 HISTORICAL problems