Chapter 10 Math 265
of the decimal point in decimal numbers. Fractions are used in cooking,
building, sewing, the stock market, and many other places.
Examples: 1/2, 3/4, 5/8
Mixed Numbers
Mixed numbers are whole numbers with a fraction included.
Examples: 32¾, 1½, 416½
Negative Numbers
Negative numbers are less than zero, but are not a fraction or a decimal.
Negative numbers are also called negative integers.
Examples: –5, –100, –235
Percentages
The term percent means per hundred. When you use a percentage, you
are working with a number by dividing it into 100 parts. For example, a
dollar can be divided into 100 pennies. One penny is 1/100th of a dollar.
Sometimes, it is easier to express a percentage using the percent sign (%).
For example, seven pennies can be expressed as 7% of a dollar.
Prime Numbers
A prime number is a number that is only divisible by itself and 1. If you
try to divide a prime number by any other number, you will have a number
and a fraction left over. A prime number must be a whole number greater
than 1 (Figure 10.1).
Nominal Numbers
Nominal numbers name something—a telephone number, a house
number, or a zip code. Nominal numbers do not show quantity or rank.
They are used only to identify something.
Examples: 417 Fern Avenue
The zip code for my hometown is 01796.
My offi ce phone number is 708-967-5732.
mixed numbers
whole numbers followed by
a remaining fraction
percentage
a number divided into 100
parts; expressed with the
percent sign (%)
prime number
a number that is only divis-
ible by itself and 1
nominal numbers
numbers that name or iden-
tify something
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67
71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163
167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269
271 277 281 283 293 307 311 313 317 331 337 347 349 353 359 367 373 379 383
389 397 401 409 419 421 431 433 439 443 449 457 461 463 467 479 487 491 499
Figure 10.1 Prime numbers