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.

Concepts

composite numbers, prime numbers, common factors, factor trees, multiplication whole numbers, common multiples, multiplication, Problem Solving

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Additional Tags

math

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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

4.OA.A.3 4.OA.B.4 MP3 MP8