Adding and Subtracting within 100

Front

What is the sum of 19 and 81?

Back

The sum of 19 and 81 is 100.

Front

What is the sum of 26 and 47?

Back

The sum of 26 and 47 is 73.

Front

What is the sum of 45 and 23?

Back

The sum of 45 and 23 is 68.

Front

What is the sum of 22 and 33?

Back

The sum of 22 and 33 is 55.

Front

What is the sum of 15 and 72?

Back

The sum of 15 and 72 is 87.

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 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 in addition does not change the sum.

Front

How do you check the result of an addition problem?

Back

You can check the result of an addition problem by subtracting one of the addends from the sum to see if you get the other addend.

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 help understand addition by showing the distance between numbers.