Addition and Subtraction Within 20

Front

What is the sum of 13 and 3?

Back

16

Front

What is the sum of 12 and 7?

Back

19

Front

What is the sum of 20 and 0?

Back

20

Front

What is the sum of 10 and 7?

Back

17

Front

What is the sum of 9 and 8?

Back

17

Front

What is the result of adding two numbers?

Back

The result is called the sum.

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 relationship between addition and subtraction?

Back

Subtraction is the inverse operation of addition.

Front

If you add 1 to a number, what happens to the number?

Back

The number increases by 1.