Using substitution to evaluate expressions

Front

What is substitution in mathematics?

Back

Substitution is the process of replacing a variable in an expression with a specific value to evaluate the expression.

Front

How do you evaluate an expression with a variable?

Back

To evaluate an expression with a variable, substitute the variable with its given value and perform the arithmetic operations.

Front

Evaluate the expression 18 ÷ 2a if a = 3.

Back

3

Front

What is the result of evaluating 4y if y = 3?

Back

12

Front

How do you express '3 less than a number'?

Back

n - 3, where n is the number.

Front

Solve the expression 6h + 30 if h = 6.

Back

66

Front

What is the algebraic expression for 'the sum of m and k'?

Back

m + k.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with their respective values.

Front

What is the importance of parentheses in expressions?

Back

Parentheses indicate the order of operations and can change the result of an expression.

Front

What is the order of operations in mathematics?

Back

The order of operations is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right), often abbreviated as PEMDAS.