Key Concepts
- Identity Properties
- Identity Property of Addition:
For any real number aa: a+0=a(0)+a=aa+0=a(0)+a=a. 00 is the additive identity - Identity Property of Multiplication:
For any real number aa:- a⋅1=aa⋅1=a
- 1⋅a=a1⋅a=a
- 11 is the multiplicative identity
- Identity Property of Addition:
- Inverse Properties
- Inverse Property of Addition: For any real number aa: a+(−a)=0−aa+(−a)=0−a is the additive inverse of aa
- Inverse Property of Multiplication: For any real number aa: (a≠0)a⋅1a=1(a≠0)a⋅1a=1. The multiplicative inverse of aa is 1a1a.
- Properties of Zero
- Multiplication by Zero: For any real number aa,
a⋅0=00⋅a=0The product of any number and 0 is 0.a⋅0=00⋅a=0The product of any number and 0 is 0. - Division of Zero: For any real number aa,
0a=00+a=0Zero divided by any real number, except itself, is zero.0a=00+a=0Zero divided by any real number, except itself, is zero. - Division by Zero: For any real number aa, 0a0a is undefined and a÷0a÷0 is undefined. Division by zero is undefined.
- Multiplication by Zero: For any real number aa,
Glossary
- Additive Identity
- The additive identity is 00. When zero is added to any number, it does not change the value.
- Additive Inverse
- The opposite of a number is its additive inverse. The additive inverse of a is −a−a .
- Multiplicative Identity
- The multiplicative identity is 11. When one multiplies any number, it does not change the value.
- Multiplicative Inverse
- The reciprocal of a number is its multiplicative inverse. The multiplicative inverse of aa is 1a1a .
Candela Citations
CC licensed content, Specific attribution
- Prealgebra. Provided by: OpenStax. License: CC BY: Attribution. License Terms: Download for free at http://cnx.org/contents/caa57dab-41c7-455e-bd6f-f443cda5519c@9.757