Pre-Algebra skills review HW

Front

What is a coefficient in an expression?

Back

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

Front

What does it mean to go left on the number line?

Back

Going left on the number line means moving towards negative numbers.

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. It is often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)).

Front

Evaluate: 20 - 3 x 5

Back

5 (Using the order of operations: first multiply 3 and 5 to get 15, then subtract from 20.)

Front

What is a variable in an expression?

Back

A variable is a symbol, often a letter, that represents an unknown value. For example, in the expression 2d, 'd' is the variable.

Front

How do you solve for a variable in an equation?

Back

To solve for a variable, isolate it on one side of the equation using inverse operations. For example, in the equation 7 + n = 11, subtract 7 from both sides to find n = 4.

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (like +, -, x, ÷) that represents a value.

Front

What is the difference between an equation and an expression?

Back

An equation states that two expressions are equal, while an expression does not include an equality sign.

Front

What does it mean to simplify an expression?

Back

To simplify an expression means to reduce it to its simplest form by combining like terms and performing operations.

Front

What are like terms?

Back

Like terms are terms that have the same variable raised to the same power. For example, 3x and 5x are like terms.