Addition and Subtraction within 20

Front

What is the sum of 16 and 2?

Back

18

Front

What is 3 plus 1?

Back

4

Front

If 5 plus a number equals 9, what is the number?

Back

4

Front

What is the result of adding 6 and 6?

Back

12

Front

What is 4 plus 0?

Back

4

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

Addition and subtraction are inverse operations; adding a number and then subtracting the same number returns the original number.

Front

What is a number line and how is it used in addition?

Back

A number line is a visual representation of numbers in a straight line, used to illustrate addition by moving to the right for positive numbers.

Front

What is the commutative property of addition?

Back

The commutative property states that changing the order of the addends does not change the sum (e.g., a + b = b + a).