Maximum:  In a set of data, it is the highest number

Minimum:  In a set of data, it is the lowest number

Range:  In a set of data, it is the difference between the maximum and the minimum

Mode:  In a set of data, is it the most often given answer

Median:  When data is arranged from smallest to largest, it is the answer found in the middle

Partial Sums:  Addition strategy that may be used to find the sum; begin in the highest place and add each value separately.

Ex.  123 + 476  Think:  100 + 400 is 500.  20 + 70 is 90.  3 + 6 is 9.  The answer is 599.

Opposite Change:  Addition strategy that is most often used as a mental math strategy; change one number to be a rounded number;  whatever change was made, the opposite must be done to the other number

Ex.  57 + 98   Think:  I'll change the 98 to 100 by adding 2, but then I'll have to take away 2 from 57 to make 55.  The answer is 155.

Traditional Addition or Subtraction:  Commonly practiced strategy of beginning in the ones place and using trades to complete the operations.

Counting Up:  Subtraction strategy that is most often used as a mental math strategy; most often used with lower numbers

Ex.  57-18  Think:  I'll begin at 18 and count up 2 to 20.  I know I'll need 37 more to get to 57, so the answer must be 37 + 2 or 39.