Addition and Subtraction Within 20

Front

What is the sum of 10 and 7?

Back

17

Front

What is 20 minus 10?

Back

10

Front

What is the sum of 11 and 6?

Back

17

Front

What is 5 minus 3?

Back

2

Front

What is 20 plus 0?

Back

20

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 identity property of addition?

Back

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

Front

What is the identity property of subtraction?

Back

The identity property of subtraction states that subtracting zero from any number does not change the value of that number.

Front

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

Back

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