Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

• the most efficient way to navigate the Engineering ToolBox!

# Real Numbers Algebra

## Real numbers algebra - commutative law for addition, associative law for addition and more

Commutative Law for Addition can be expressed as

a + b = b + a         (1)

Associative Law for Addition can be expressed as

(a + b) + c = a + (b + c)         (2)

Identity Law for Addition can be expressed as

a + 0 = 0 + a         (3)

Inverse Law of Addition can be expressed as

a + (-a) = (-a) + a = 0         (4)

### Associative Law for Multiplication

Associative Law for Multiplication can be expressed as

a · (b · c) = (a · b) · c         (5)

### Inverse Law for Multiplication

Inverse Law for Multiplication can be expressed as

a · (1 / a) = (1 / a) · a = 1, a ≠ 0           (6)

### Identity Law for Multiplication

Identity Law for Multiplication can be expressed as

(a) · (1) = (1) · (a)           (7)

### Commutative Law for Multiplication

Commutative Law for Multiplication can be expressed as

a · b = b · a         (8)

### Distributive Law

Distributive Law can be expressed as

a · (b + c) = a · b + a ·c         (9)

## Related Topics

• Basics - The SI-system, unit converters, physical constants, drawing scales and more

## Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

## SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

## Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

8 27