Unit 5 · Number Theory

Chapter 5.8

Which Idea Opens It? Number Theory

Primes, remainders, parity, and factoring can all look like the right tool; usually only one of them is fast.

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By the end

  1. 01Name the number theory idea that opens each problem from its wording
  2. 02Set up each problem in a few lines before computing

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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