Questions and Answers
What is a variable?
A letter that represents a number; it is a placeholder for a number.
What is a numerical expression?
A mathematical phrase involving only numbers and one or more operational symbols.
Define an algebraic expression.
A mathematical phrase combining numbers and/or variables that does not contain an equal sign but may include other operators and grouping symbols.
What are equivalent expressions?
Signup and view all the answers
What is a term in mathematics?
Signup and view all the answers
What is a coefficient?
Signup and view all the answers
Define a constant.
Signup and view all the answers
What is an equation?
Signup and view all the answers
What is the commutative property of addition and multiplication?
Signup and view all the answers
Explain the associative property of addition and multiplication.
Signup and view all the answers
What is the distributive property?
Signup and view all the answers
Define multiplicative inverse.
Signup and view all the answers
What is a rational number?
Signup and view all the answers
What is the order of operations?
Signup and view all the answers
What does it mean to combine like terms?
Signup and view all the answers
Define an inequality.
Signup and view all the answers
Study Notes
Variable and Expressions
- A variable is a letter that stands for a number, acting as a placeholder.
- Numerical expression consists of numbers and operational symbols only, such as addition or multiplication.
- An algebraic expression combines numbers and variables without an equal sign, utilizing operators and grouping symbols.
Equations and Properties
- Equivalent expressions yield the same value when variables are substituted with numbers.
- A term is a singular unit within an expression, which can be a number or variable, separated by "+" or "-" signs.
- The coefficient multiplies the variable in an expression, indicating its scale.
- A constant is a fixed value that does not change, presented as an individual number.
- An equation asserts that two mathematical expressions are identical.
Mathematical Properties
- The Commutative Property of Addition and Multiplication states that numbers can be added or multiplied in any order without affecting the outcome.
- The Associative Property of Addition and Multiplication allows regrouping of numbers during addition or multiplication without changing the result, illustrated by: 1 + (2 + 3) = (1 + 2) + 3.
- The Distributive Property entails that multiplying a number by a sum is equivalent to multiplying that number with each addend separately (e.g., 3(x + 6) = 3x + 18).
Number Types and Operations
- The multiplicative inverse of a number is its reciprocal; their product equals 1.
- A rational number can be expressed as a fraction or a decimal that either terminates or repeats.
- The order of operations dictates the sequence in which mathematical operations are conducted to ensure consistent results.
- Combining like terms refers to the simplification of expressions by merging constants or similar terms sharing the same variable and exponent.
Inequalities
- An inequality is a mathematical sentence that uses symbols like ≤ or ≥ to show the relationship between expressions.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on key concepts from 7th grade I-Ready relating to expressions and equations. This quiz covers important terms such as variables and expressions, helping you solidify your understanding of algebraic concepts. Perfect for students looking to review foundational algebra skills.