Lesson 2

Using Common Denominators

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
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TIMS Task

This DPP item can be used to practice math facts.

F. Factor Trees

Make two different factor trees to find the prime factorization of the following numbers. Write each number as a product of primes using exponents. The first one is an example.

Example:



  1. 72 72
  2. 90 90
  3. 140 140