about add, subtract, multiply, and divide

add /verb/

1 [transitive] to put something together with something else so as to increase the size, number, amount, etc. 

add something

• Next add the flour. 

add something to something

• Shall I add your name to the list? 

• Chlorine is added to the water to kill bacteria. 

add that..

• He added that they would return a week later.

addition  /noun/
[uncountable] the process of adding two or more numbers together to find their total

•  children learning addition and subtraction

addition (to something)  
a thing that is added to something else

• the latest addition to our line of cars 

• an addition to the family (= another child)

additional /adjective/

more than was first mentioned or is usual

synonym ----extra

• additional resources/funds/security 
• The government provided an additional $25 million to expand the service.

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subtract/verb/

to take a number or an amount away from another number or amount

synonym  --take away

subtract (something) (from something)

•  if you subtract 30 from 45, you get 15.

subtraction/noun/ 
the process of taking a number or amount from a larger number or amount
synonym - addition 

minus 
/preposition/
used when you subtract (= take away) one number or thing from another one.

• Seven minus three equals four (7−3=4). 

used to express temperature below zero degrees.

• It was minus ten. 

/noun/ 
  (also minus sign) The symbol (−), used in mathematics

• Let's consider the pluses and minuses of changing the system.  

antonym-----plus1
/adjective/
(mathematics) lower than zero

• a minus number.

making something seem negative and less attractive or good 

• What are the car's minus points (= the disadvantages)? 

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 multiply/verb/
multiplies, multiplying, multiplied, multiplied
to add a number to itself a particular number of times

• The children are already learning to multiply and divide.

multiply A by B 

• 2 multiplied by 4 is/equals/makes 8 (2×4 = 8)

multiply A and B (together) 

• Multiply 2 and 6 together and you get 12.

multiplication/noun/ 

[uncountable]

the act or process of multiplying

• the multiplication sign (×)
• Multiplication of cells leads to rapid growth of the organism.

multiplier/noun/

a number by which another number is multiplied

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divide/verb/ 

divide (something) by something

to find out how many times one number is contained in another

• 30 divided by 6 is 5 (30 ÷ 6 = 5).

divide (something) into something

to be able to be multiplied to give another number

• 5 divides into 30 6 times.

divider/noun/ 

[countable] a thing that divides something

• a room divider (= a screen or door that divides a room into two parts)

division/noun/

[uncountable, singular] the process or result of dividing into separate parts; the process or result of dividing something up or sharing it between people or things 

• cell division