Topic 2 Math Flashcards

Front

Compatible Numbers

Back

Numbers that are easy to compute mentally.

Front

Associative Property of Addition

Back

Changing the grouping of numbers does not change their sum. Example: (a + b) + c = a + (b + c)

Front

Commutative Property of Addition

Back

Changing the order of numbers does not change their sum. Example: a + b = b + a

Front

Compensation

Back

Adjusting one number to make calculations easier and balancing the adjustment by changing another number.

Front

Example of Compatible Numbers

Back

17 + 18 + 2: 18 + 2 = 20, 20 + 17 = 37

Front

Example of Associative Property

Back

1 + (3 + 5) = (1 + 3) + 5

Front

Example of Commutative Property

Back

3 + 7 = 7 + 3

Front

Example of Compensation

Back

An example of compensation: Adjust 22 to 20, add 17 to get 37, then add 2 to get 39.