# Real Number Chart ```LSC-O Learning Center
Real Number Chart
ℝ
Real Numbers
(409) 882-3373
Ron E. Lewis Library
building, rm. 113
Includes all Rational and Irrational Numbers
3
− , −1, 0 , 1, √2, 𝜋, 6.35, 273
5
ℚ stands for
“quotient.”
ℚ
Rational Numbers
Irrational Numbers
Can be expressed as a ratio of two Integers: a/b, (b ≠ 0); such ratios
(fractions) can be expressed as terminating or repeating decimals
1
3
−6, − (−0.333 . . . ), 0, (0.75), 25
3
4
3
∗ 𝑆𝑆𝑆𝑆 𝑟𝑟𝑟𝑟𝑟 𝑎𝑎𝑎 𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟: √100 = 10, √8 = 2
Non-Integer Rational Numbers
Fractions, terminating and repeating decimals
1
9
13
(0.8181 . . . ),
− (−0.5),
(1.3)
2
11
10
All Real Numbers that are NOT Rational Numbers; cannot be expressed as
fractions, only non-repeating, non-terminating decimals
3
*Even roots (such as square roots) that don’t simplify to whole numbers are irrational.
*Odd roots (such as cube roots) that don’t simplify to whole numbers are irrational.
∗ 𝑃𝑃 (𝜋), 𝐸𝐸𝐸𝐸𝑟 ′ 𝑠 𝑛𝑛𝑛𝑛𝑛𝑛 (ℯ), 𝑎𝑎𝑎 𝑡ℎ𝑒 𝐺𝐺𝐺𝐺𝐺𝐺 𝑅𝑅𝑅𝑅𝑅 (𝜑) 𝑎𝑎𝑎 𝑖𝑖𝑖𝑖𝑖𝑖𝑖𝑖𝑖𝑖.
ℤ
Integers
Positive and Negative Non-fractional Rational
Numbers, including Zero
. . . −3, −2, −1, 0, 1, 2, 3, . ..
Positive Integers, including Zero
0. 1. 2, 3, . . . , 476, . ..
Negative Integers
. . . −476, . . . , −3, −2, −1
http://www.lsco.edu/learningcenter/math.asp
ℤ stands for
“zahlen,” German
for “numbers.”
𝕎
Whole Numbers
Negative Numbers
Find this and other math
resources on the LSC-O
Learning Center Math
Tutorials page.
3
−√2 , − √5 , √21, √81, √101 , 𝜋, ℯ, 𝜑
Zero
0
ℕ
Natural Numbers
Counting Numbers
1, 2, 3, . . . , 476, . . .
EP, 7/2013
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