Understanding Variable Expressions

What is a variable in mathematical expressions?

• A type of equation

• A mathematical operation

• A symbol representing an unknown number

• A fixed number

How would you express 'the total of 12 and x'?

• 12 / x

• 12 + x

• 12 * x

• 12 - x

What does the commutative property of addition allow you to do?

• Divide numbers in any order

• Subtract numbers in any order

• Add numbers in any order

• Multiply numbers in any order

How would you write '76 less than x'?

• 76 + x

• x - 76

• 76 - x

• x + 76

In subtraction expressions, why is the order important?

• Because subtraction is a division

• Because subtraction is not commutative

• Because subtraction is always negative

• Because subtraction is the same as addition

How would you express 'x subtracted from 64'?

• x + 64

• 64 - x

• x - 64

• 64 + x

What does '45 increased by x' mean?

• 45 + x

• 45 / x

• 45 - x

• 45 * x

How would you write '22 greater than x'?

• x + 22

• 22 - x

• x - 22

• 22 + x

What does 'x reduced by 66' mean?

• 66 - x

• 66 + x

• x + 66

• x - 66

How would you express 'x fewer than 50'?

• 50 - x

• x - 50

• 50 + x

• x + 50