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Speed Math by Gaurav Tekriwal

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CHAPTER9

Divisibility

In This Chapter

  • Divisibility rules for numbers under 10
  • Using the osculation method to determine divisibility
  • The difference between positive and negative osculators

Finding out what numbers divide into another number can be a tedious process. You may spend a lot of time just inputting numbers into the calculator. However, it doesn’t have to be that difficult!

In this chapter, I take you through some common divisibility rules you can apply to your calculations. I also teach you about a method called osculation, which can make determining what a number’s divisible by much simpler.

Divisibility Rules

If you have a divisor ...

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