Find the Missing Number

Front

What is a missing number?

Back

A missing number is a number that is not shown in a sequence or equation, and needs to be found to complete it.

Front

How do you find a missing number in a simple addition problem?

Back

To find a missing number in an addition problem, subtract the known number from the total. For example, if 3 + ? = 5, then ? = 5 - 3, so ? = 2.

Front

What is subtraction?

Back

Subtraction is the process of taking one number away from another. It is the opposite of addition.

Front

If 7 - ? = 4, what is the missing number?

Back

The missing number is 3, because 7 - 3 = 4.

Front

What is an equation?

Back

An equation is a mathematical statement that shows that two expressions are equal, often using an equals sign (=).

Front

How can you check if your answer is correct?

Back

You can check your answer by plugging it back into the original equation to see if both sides are equal.

Front

What does it mean to solve for a number?

Back

To solve for a number means to find the value of the unknown number in an equation.

Front

If 5 + ? = 10, what is the missing number?

Back

The missing number is 5, because 5 + 5 = 10.

Front

What is a number line?

Back

A number line is a straight line that represents numbers in order, where each point corresponds to a number.

Front

How can a number line help find missing numbers?

Back

A number line can help visualize the distance between numbers, making it easier to see what number is missing.