Writing Basic Expressions with Variables

SWBAT Write Basic Expressions with Variables

Numerical and Algebraic Expressions

• we can write numerical expressions using phrases/words and operations

• we can write algebraic expressions using phrases/words, variables, and operations

Different words tell us to add, subtract, multiply or divide...

Can you think of any?

Words that mean ADDITION

plus, sum, more than, increased by, greater than, added to

Let's try writing some addition expressions!

• 10 more than 2

• 6 added to y

• the sum of 11 and 5

Multiple Choice

Which expression shows "the sum of 5 and x"

• 5 - x

• 5 + x

• 5x

• 5/x

Multiple Choice

Which is the correct expression for "15 + g"?

• the product of 15 and g

• g added to 15

• the difference of 15 and g

Words that mean SUBTRACTION

*Keep in mind order matters

less than, subtracted from, difference, decreased by, minus

Let's try writing some subtraction expressions!

• x minus 5

• 3 take away 2

• 7 subtracted from 10

Multiple Choice

Which expression shows "the difference of x and y"?

• x + y

• x / y

• y - x

• x - y

Words that mean MULTIPLICATION

product, times, multiply, groups of

Let's try writing some multiplication expressions!

• the product of 5 and x

• 7 times 10

• 8 multiplied by n

Multiple Choice

Which expression shows "7 groups of r"?

• 7 - r

• 7r

• 7 + r

• 7 / r

Words that mean DIVISION

*keep in mind order matters

quotient, divided by, split up

Let's try writing some division expressions!

• 6 divided by y

• the quotient of 10 and 2

Multiple Choice

Which expression shows "the quotient of 2 and n"?

• 2 - n

• 2 + n

• 2 / n

• 2 x n

Multiple Choice

Which expression shows "x divided by y" ?

• y/x

• x/y

• x - y

• y + x