Pre-Algebra skills review HW

Front

What is a coefficient in an expression?

Back

A coefficient is a numerical factor that multiplies a variable in an algebraic expression. For example, in the expression 10y, 10 is the coefficient.

Front

Write a numerical expression for: the cost of ten books if each costs three dollars.

Back

10 * 3

Front

What is a variable in an expression?

Back

A variable is a symbol (usually a letter) that represents an unknown value in an algebraic expression. For example, in the expression 2d, d is the variable.

Front

Solve for n: 7 + n = 11

Back

n = 4

Front

Write a numerical expression for: the sum of nine and twelve.

Back

9 + 12

Front

What is an algebraic expression?

Back

An algebraic expression is a combination of numbers, variables, and operations (like addition, subtraction, multiplication, and division). For example, 3x + 5 is an algebraic expression.

Front

What does it mean to solve an equation?

Back

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

Front

What is the difference between an expression and an equation?

Back

An expression is a combination of numbers and variables without an equality sign, while an equation states that two expressions are equal, using an equality sign.

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that determines the sequence in which calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right). Often remembered by the acronym PEMDAS.

Front

What is a numerical expression?

Back

A numerical expression is a mathematical phrase that includes numbers and operation symbols but no variables. For example, 4 + 5 is a numerical expression.