Adding Expressions with Variables and Constants

12 times the sum of a and b

• a + b - 12

• 12 x a = b

• 12(a+b)

• 12 x a - b

Which matches the expression below?

• Five times a number increased by two.

• The sum of five and twice a number.

• Two more than the product of five and a number.

What is the number in front of, or being multiplied by, a variable called?

• Coefficient

• Constant

• Term

• Variable

What is a series of constants, coefficients, and variables being added and subtracted without an equal sign called?

• Equation

• Expression

• Term

• Variable

(7r+2s)+(6r+3s)

• 13r+5s

• r+5s

• r-s

• 13r-s

(2a-1)-(-5a-5)

• 7a+4

• (-3a) +4

• (-3a) - 6

• 7a-6

(10x + 2) - (8x - 4)

• 2x - 2

• 2x + 6

• 18x + 6

• 18x - 2

(2x - 6) + (4x - 4)

• 6x + 10

• 6x - 10

• 6x + 2

(3r-7)+(17r-6)

• 20r-13

• 20r

• 20r+13

• 20r+1

Which answer correctly states what each part of this expression is called?

• 8 is the variable

  m is the coefficient

  5 is the constant

• 8 is the coefficient

  m is the variable

  5 is the constant

• 8 is the constant

  m is the variable

  5 is the coefficient

• 8 is the coefficient

  m is the constant

  5 is the variable