​difference- the result of subtraction.

Example: 9 - 7 = 2



Difference

​fact family - a group of related equations that use the same numbers, but in a different order, and two different operation symbols. A fact family can show the relationship between addition and subtraction.

Example:
3 + 4 = 7
4 + 3 = 7
7 - 4 = 3
7 - 3 = 4

​equation= a mathematical statement that uses an equal sign (=) to show that two things have the same value.

Example:
6 + 2 = 8
8 = 6 + 2
5 + 1 = 2 + 4

​open number line = a straight line with only the numbers important to a problem labeled.

​subtract - to take from, take apart or compare to find the difference.