Unknown Numbers 3.OA.4

Front

What is an unknown number in an equation?

Back

An unknown number is a value that we do not know yet, often represented by a letter like x, y, or h.

Front

If 18 = h x 2, what is h?

Back

h = 9

Front

What does the division symbol (÷) represent?

Back

The division symbol represents splitting a number into equal parts.

Front

If 14 ÷ b = 2, what is b?

Back

b = 7

Front

What is the multiplication symbol (x) used for?

Back

The multiplication symbol is used to indicate that a number is to be added to itself a certain number of times.

Front

If ____ x 3 = 21, what is the missing number?

Back

The missing number is 7.

Front

What does it mean to solve for a variable?

Back

To solve for a variable means to find the value of that variable that makes the equation true.

Front

If p x 4 = 24, what is p?

Back

p = 6

Front

What is the relationship between multiplication and division?

Back

Multiplication and division are inverse operations; one undoes the other.

Front

If y ÷ 5 = 2, what is y?

Back

y = 10