Mathematics Grade 8 15 min

Divide monomials

Divide monomials

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1

Introduction & Learning Objectives

Learning Objectives Identify the components of a monomial (coefficient, variable, exponent). Apply the Quotient Rule for Exponents when dividing variables with the same base. Divide numerical coefficients in monomial division problems. Simplify expressions involving division of monomials with single variables. Simplify expressions involving division of monomials with multiple variables. Recognize and apply the Zero Exponent Rule in monomial division. Express simplified monomial divisions with positive exponents. Ever wondered how engineers simplify complex formulas to make them easier to work with? 🏗️ It's like breaking down a big task into smaller, manageable steps! In this lesson, you'll learn how to divide monomials, which are single-term algebraic expression...
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Key Concepts & Vocabulary

TermDefinitionExample MonomialAn algebraic expression consisting of only one term, which is a product of numbers and variables with non-negative integer exponents.5x^3, -7y, 1/2ab^2 CoefficientThe numerical factor of a monomial, usually written before the variables.In 7y^2, the coefficient is 7. In -x^4, the coefficient is -1. VariableA letter or symbol representing an unknown value or quantity.In 3ab^4, 'a' and 'b' are variables. ExponentA number that indicates how many times the base is multiplied by itself.In x^5, 5 is the exponent, meaning x * x * x * x * x. BaseThe number or variable that is multiplied by itself the number of times indicated by the exponent.In y^3, 'y' is the base. Like TermsTerms that have the same variables raised to the same powers. W...
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Core Formulas

Quotient Rule for Exponents $\frac{a^m}{a^n} = a^{m-n}$ When dividing powers with the same non-zero base, subtract the exponent of the denominator from the exponent of the numerator. Dividing Coefficients $\frac{ca^m}{da^n} = \frac{c}{d} \cdot a^{m-n}$ Divide the numerical coefficients as you would with regular fractions or integers, and then apply the exponent rules to the variables. Zero Exponent Rule $a^0 = 1$ Any non-zero base raised to the power of zero is equal to 1. This often occurs when the exponents of a variable are the same in the numerator and denominator.

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Sample Practice Questions

Challenging
A student simplified the expression $\frac{20a^4b^3}{5a^4b}$ and got the answer $4b^3$. What was their mistake?
A.They subtracted the coefficients instead of dividing them.
B.They forgot to apply the Zero Exponent Rule to the 'a' terms.
C.They did not subtract the exponents for the 'b' variable.
D.They added the exponents for the 'b' variable instead of subtracting.
Challenging
Simplify the expression $\frac{k^{5n+2}}{k^{2n-1}}$, assuming k is not zero and n is an integer.
A.$k^{3n+1}$
B.$k^{3n+3}$
C.$k^{7n+1}$
D.$k^{3n-3}$
Challenging
The volume of a rectangular prism is $96x^{10}y^6z^3$. The area of its base is $12x^4y^2z$. What is the height of the prism? (Volume = Base Area × height)
A.$84x^6y^4z^2$
B.$8x^{14}y^8z^4$
C.$1152x^{14}y^8z^4$
D.$8x^6y^4z^2$

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