Unit 5 · Number Theory

Chapter 5.1

Factor Into Primes First

When a number problem looks stuck, writing every number as a product of primes almost always gets it moving.

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By the end

  1. 01Factor into primes to test divisibility and square or cube conditions
  2. 02Count and sum divisors from a prime factorization
  3. 03Count trailing zeros and prime powers in a factorial

In unit 5

  1. 5.1Factor Into Primes First
  2. 5.2Divisibility, GCD, and LCM
  3. 5.3Odd and Even
  4. 5.4Remainders and Cycles
  5. 5.5Digits, Bases, and Decimals
  6. 5.6Equations in Whole Numbers
  7. 5.7Whole Numbers Are Information
  8. 5.8Which Idea Opens It? Number Theory
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