what does this symbol mean ±
Answers
Answer:
The symbol means plus Or minus
Step-by-step explanation:
+ Addition
The addition symbol + is usually used to indicate that two or more numbers should be added together, for example, 2 + 2.
The + symbol can also be used to indicate a positive number although this is less common, for example, +2. As our page on Positive and Negative Numbers explains, a number without a sign is considered to be positive, so the plus is not usually necessary.
See our page on Addition for more.
− Subtraction or Minus
This symbol has two main uses in mathematics:
- is used when one or more numbers are to be subtracted, for example, 2 − 2.
The - symbol is also commonly used to show a minus or negative number, such as −2.
See our page on Subtraction for more.
× or * or . Multiply
These symbols have the same meaning; commonly × is used to mean multiplication when handwritten or used on a calculator 2 × 2, for example.
The symbol * is used in spreadsheets and other computer applications to indicate a multiplication, although * does have other more complex meanings in mathematics.
Less commonly, multiplication may also be symbolised by a dot . or indeed by no symbol at all. For example, if you see a number written outside brackets with no operator (symbol or sign), then it should be multiplied by the contents of the brackets: 2 (3+2) is the same as 2 x (3+2).
See our page on Multiplication for more.
÷ or / Divide
These symbols are both used to mean division in mathematics. ÷ is used commonly in handwritten calculations and on calculators, for example, 2 ÷ 2.
/ is used in spreadsheets and other computer applications.
See our page on Division for more.
= Equals
The = equals symbol is used to show the result of the calculation, 2 + 2 = 4.
You may also come across other related symbols, although these are less common:
≠ means not equal. For example 2 + 2 ≠ 5 - 2. In computer applications (like Excel) the symbols <> mean not equal.
≡ means identical to. Similar, but not exactly the same as equals. If in doubt, stick to =.
≈ means approximately equal to, or almost equal to. The two sides of a relationship indicated by this symbol will not be accurate enough to manipulate mathematically.
< Less Than and > Greater Than
This symbol < means less than, for example 2 < 4 means that 2 is less than 4.
This symbol > means greater than, for example 4 > 2.
≤ ≥ These symbols mean ‘less than or equal to’ and ‘greater than or equal to’ and are commonly used in algebra. In computer applications <= and >= are used.
≪ ≫ These symbols are less common and mean much less than, or much greater than.
± Plus or Minus
This symbol ± means ‘plus or minus’. It is used to indicate, for example, confidence intervals around a number.
The answer is said to be ‘plus or minus’ another number, or in other words, within a range around the given answer.
For example, 5 ± 2 could in practice be any number from 3 to 7.
∑ Sum
The ∑ symbol means sum.
∑ is the Greek capital sigma symbol. Used commonly in algebraic functions, you may also notice it in Excel - the AutoSum button has a sigma as its icon.
° Degree
Degrees ° are used in several different ways.
As a measure of rotation - the angle between the sides of a shape or the rotation of a circle. A circle is 360° and a right angle is 90°. See our section on Geometry for more.
A measure of temperature. Degrees Celsius or Centigrade are used in most of the world (with the exception of the USA). Water freezes at 0°C and boils at 100°C. In the USA Fahrenheit is used on the Fahrenheit scale water freezes at 32°F and boils at 212°F. See our page: Systems of Measurement for more information.
∠ Angle
The angle symbol ∠ is used as shorthand in geometry (the study of shapes) for describing an angle.
The expression ∠ABC is used to describe the angle at point B (between points A and C). Similarly, ∠BAC would be used to describe the angle of point A (between points B and C). For more on angles and other geometric terms see our pages on Geometry.
√ Square Root
√ is the symbol for square root. A square root is the number that, when multiplied by itself, gives the original number.
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