Addition is the basic operation of arithmetic. In its simplest form, addition combines two numbers, the addends or terms, into a single number, the sum.

Adding more than two numbers can be viewed as repeated addition; this procedure is known as summation and includes ways to add infinitely many numbers in an infinite series; repeated addition of the number one is the most basic form of counting.

Addition is commutative and associative so the order in which the terms are added does not matter. The identity element of addition (the additive identity) is 0, that is, adding zero to any number will yield that same number. Also, the inverse element of addition (the additive inverse) is the opposite of any number, that is, adding the opposite of any number to the number itself will yield the additive identity, 0. For example, the opposite of 7 is (-7), so 7 + (-7) = 0. Addition can be given geometrically as follows.

If a and b are the lengths of two sticks, then if we place the sticks one after the other, the length of the stick thus formed will be a+b

• Adding 1
  
• Adding 2
  
• Adding 3
  
• Adding And Subtracting Decimals 1
  
• Adding And Subtracting Decimals 2
  

See All Addition Worksheets

• The attendance at a ball game was 400 people (#72)
  The attendance at a ball game was 400 pe... ...w many of each type of ticket were sold?
  
  addition, arithmetic operations, distributive property, multiplication, operations, properties of addition, properties of multiplication
• Students were asked to choose (#924)
  Students were asked to choose their favo... ...raction chose either history or biology?
  
  adding fractions, addition, addition of fractions, arithmetic operations, fractions, number sense, numbers, operations, operations with fractions
• Kent is 14 years older than Harlen (#256)
  Kent is 14 years older than Harlen.
  Nex... ...mes older than Harlen.
  How old is Kent?
  
  addition, arithmetic operations, distributive property, multiplication, operations, properties of addition, properties of multiplication
• A nut mixture contains peanuts, walnuts, and casheews (#427)
  A nut mixture contains peanuts, walnuts,... ...the total amount of nuts in the mixture.
  
  addition, arithmetic operations, distributive property, multiplication, operations, properties of addition, properties of multiplication
• distributive property (#528)
  You have six gummy worms and eleven stic... ...Use the distributive property to solve.
  
  addition, arithmetic operations, distributive property, multiplication, operations, properties of addition, properties of multiplication

See All Addition Word Problems

• -2+(-21)=?
• 3/4 + 3/4
• 1/8+4/8
• f+2(3-f)=4
• Substitution and the distributive property using substraction
  7x-8y=12
  y=-2x+9
• (-8)+4
• 2(3+p) - 2 + 6p

Good job!
September 22, 2009, 11:47 pm

How many legs in total do a chicken, a duck, and a sheep have?