Writing Expressions Before and After Flashcard

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

How do you represent a quantity that decreases by a variable amount?

Back

You can represent it by subtracting the variable from the original quantity, e.g., if there are 47 frogs and 'f' frogs hop away, the expression is 47 - f.

Front

What does the variable 'b' represent in the expression 92 ÷ b?

Back

The variable 'b' represents the number of bags into which the 92 prizes are being split.

Front

How do you calculate the total cost for multiple items at a constant price?

Back

Multiply the price per item by the number of items, e.g., if tickets cost $27 each and 'n' is the number of people, the total cost is 27n.

Front

What is the total cost expression for parking and tickets if parking costs $12 and tickets cost $10 per person?

Back

The total cost expression is 12 + 10p, where 'p' is the number of people.

Front

How do you express the total number of items arranged in rows?

Back

Multiply the number of rows by the number of items per row, e.g., if there are 'r' rows of chairs with 8 chairs each, the expression is 8r.

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 is the purpose of using variables in expressions?

Back

Variables allow us to represent unknown quantities and create general formulas that can be applied to various situations.

Front

How can you represent a situation where a fixed cost is added to a variable cost?

Back

You can represent it by adding the fixed cost to the variable cost, e.g., total cost = fixed cost + variable cost.

Front

What does the term 'application-based questions' refer to in mathematics?

Back

Application-based questions require students to apply mathematical concepts and expressions to solve real-world problems.