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For instance, if the temperature is ten degrees below zero, it is usually written as -10 degrees. Most likely you have encountered signed numbers many times in your newspaper or on TV. These positive and negative numbers are referred to as signed numbers or directed numbers.
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Also note that "to the right" is a positive direction and "to the left" is a negative direction. Hence +7 or simply 7 would represent positive seven. If a nonzero number is written without a sign, it is assumed to be a positive number.
#FIND THE NUMBERS HELP PLUS#
The numbers to the right of zero are called positive numbers and are written with a plus sign. The number line containing the rational numbers is called the rational number line. Fractions, such as will fall proportionally on the number line. The set of numbers that can be expressed as the ratio of two integers is called the set of rational numbers. The whole numbers that we have studied up to this point and the negative whole numbers together make up the set of numbers called integers. The arrows indicate that the line continues indefinitely in either direction.
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Numbers such as -6, -1, and -10 are read as "negative six," "negative one," and "negative ten." Such numbers are called negative numbers and are written with a minus sign preceding them. We now wish to extend our thinking to include numbers to the left of zero. We then agree that we will place numbers at other points on the line such that a larger number is to the right and that all units (0 to 1, 4 to 5,10 to 11, and so on) will be of equal length. We start by placing zero at a point on the line. We can represent the numbers of arithmetic on a number line. Find the absolute value of a given number.Remove grouping symbols preceded by a minus sign.Locate signed numbers on a number line.Upon completing this section you should be able to: The remainder of your study of algebra will involve this new set of numbers. In this chapter we wish to introduce the set of signed numbers or directed numbers and establish the four basic operations on this set.