Algebra basics

A symbol (usually a letter) that stands for an unknown number is a(n)

• equation

• expression

• variable

• product

The inverse operation of addition is

• multiplication

• addition

• subtraction

• division

Solve for b: b + 3 = 12

• b = 9

• b = 15

• b = 36

• b = 4

Solve for n: n - 20 = 60

• n = 40

• n = 50

• n = 1200

• b = 80

What is another way to write 14 x r?

• 14r

• 14 + r

• 14 / r

• There is no other way.

Which expression shows the phrase "87 reduced by m"?

• m - 87

• 87 - m

• 87 / m

• m / 87

Which expression shows the phrase "the product of 80 and z"?

• 80 + z

• 80 - z

• 80z

• 80 / z

Which expression shows the phrase "the difference between 91 and t"?

• 91 - t

• 91t

• 91 / t

• 91 + t

Which expression shows the phrase "45 less than f"?

• f - 45

• 45 - f

• 45f

• f/45

Which expression would you use to solve this problem: Sara planted "r" rows of carrots with 6 carrot seeds in each row. How many carrots did she plant all together?

• 6 + r

• 6 - r

• 6r

• 6 / r