Subtraction    ➖

Subtraction is the process of taking one number or amount away from another to find the difference. It's the opposite of addition, which is when numbers are added together to find the sum. 

Subtraction is used in many everyday situations, such as:

• Calculating how much money is left after making a purchase 

• Determining how much time is remaining to complete a task 

Here are some tips for subtracting numbers:

• Place the number being subtracted under the number being subtracted from so that the place values in the same column match.

• Start with the ones column and subtract each column separately.

• Write the result of the subtraction below each column. 

Subtraction is anti-commutative, which means that reversing the order of the terms in a difference will result in the negative of the original result. 

Some keywords that signal subtraction include:

Decreased by, Diminished by, Subtract, Reduce, Difference, Less than, and From.