Addition and Subtraction Within 20

Front

What is the sum of 11 and 5?

Back

16

Front

How do you add 9 and 4 by counting on?

Back

Start with 9 and count up 4 more: 10, 11, 12, 13. The answer is 13.

Front

What is 18 minus 4 when subtracting by counting back?

Back

Start from 18 and count back 4: 17, 16, 15, 14. The answer is 14.

Front

If John has 15 apples and gives 5 to Peter, how can we represent this with a subtraction equation?

Back

15 - 5 = 10.

Front

What is the result of adding 11 and 3?

Back

14

Front

What is the definition of addition?

Back

Addition is the process of finding the total or sum by combining two or more numbers.

Front

What is the definition of subtraction?

Back

Subtraction is the process of finding the difference between two numbers by taking one number away from another.

Front

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

Back

A number line is a straight line with numbers placed at equal intervals. It is used to visualize addition by starting at one number and moving to the right.

Front

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

Back

A number line is a straight line with numbers placed at equal intervals. It is used to visualize subtraction by starting at one number and moving to the left.

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. For example, 3 + 5 = 5 + 3.