Add and subtract within 20

Front

What is the sum of 2 and 8?

Back

10

Front

What is 18 minus 5?

Back

13

Front

What is 12 minus 2?

Back

10

Front

What is 17 minus 3?

Back

14

Front

What is the sum of 4 and 9?

Back

13

Front

What is the definition of addition?

Back

Addition is the mathematical operation of combining two or more numbers to get a total.

Front

What is the definition of subtraction?

Back

Subtraction is the mathematical operation of taking one number away from another.

Front

What is the commutative property of addition?

Back

The commutative property of addition states that changing the order of the addends does not change the sum.

Front

What is the associative property of addition?

Back

The associative property of addition states that the way in which numbers are grouped does not change their sum.

Front

What is the identity property of addition?

Back

The identity property of addition states that adding zero to any number does not change the number.