Number and Operations: Primes, Composites and Common Factors

This Number and Operations: Primes, Composites and Common Factors worksheet also includes:

Incorporate riddles into your math lesson by having students make tree factors and determine if the number is a prime or composite. They will also use other clues to find the answer to the riddle while sharpening their multiplication skills.

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CCSS: Adaptable
Instructional Ideas

  • Supplement this resource into a primary lesson series on common factors
  • Drawing factor trees and Venn diagrams can be messy if students are trying to solve the problem in a small space; make sure they have plenty of paper and space to answer the equations
  • Consider whether or not you want kids using a calculator. If you don't, edit the sentence permitting them to do so 
Classroom Considerations

  • Use projector to explain the lesson using factor trees and Venn diagrams so pupils have a better understanding before exploring on their own
  • Graph paper might be useful for solving the equations 
Pros

  • Extension activities included
  • Worksheet bridges gap from knowing it to doing it
Cons

  • None
Common Core