Читать книгу Algebra I All-in-One For Dummies - Mary Jane Sterling, Mary Sterling Jane - Страница 36

IN THIS CHAPTER

Using the number line

Recognizing operations

Operating on signed numbers: adding, subtracting, multiplying, and dividing

Numbers have many characteristics: They can be big, little, even, odd, whole, fractions, positive, negative, and sometimes cold and indifferent. (I’m kidding about that last one.) Chapter 1 describes numbers’ different names and categories. But this chapter concentrates mainly on how numbers compare to one another, what their comparison looks like on the number line, the positive and negative characteristics of numbers, and how a number’s sign reacts to different manipulations. This chapter tells you how to add, subtract, multiply, and divide signed numbers, no matter whether all the numbers are all the same sign or a combination of positive and negative.