February 2014
Beginner
384 pages
6h 58m
English
Content preview from Basic Math and Pre-Algebra For Dummies, 2nd Edition
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Chapter 7
Divisibility
In This Chapter
Finding out whether a number is divisible by 2, 3, 5, 9, 10, or 11
Seeing the difference between prime numbers and composite numbers
When one number is divisible by another, you can divide the first number by the second number without getting a remainder (see Chapter 3 for details on division). In this chapter, I explore divisibility from a variety of angles.
To start, I show you a bunch of handy tricks for discovering whether one number is divisible by another without actually doing the division. (In fact, you don't find long division anywhere in this chapter!) After that, I talk about prime numbers and composite numbers (which I introduce briefly in Chapter 1).
This discussion, plus what follows in Chapter 8, can help make your encounter with fractions in Part III a lot friendlier.
Knowing the Divisibility Tricks
As you begin to work with fractions in Part III, the question of whether one number is divisible by another comes up a lot. In this section, I give you a bunch of time-saving tricks for finding out whether one number is divisible by another without actually making you do the division.
Counting everyone in: Numbers you can divide everything by
Every number is divisible by 1. As you can see, when you divide any number by 1, the answer ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.