Properties of Multiplication Quiz

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Questions and Answers

What does the associative property of multiplication state?

  • a × (b × c) = (a × b) × c (correct)
  • a × b = b × a
  • a × 1 = a
  • a × (b + c) = (a × b) + (a × c)

Which of the following is an example of the distributive property of multiplication?

  • 5 × 70 = 70 × 5
  • 2 × 1 = 2
  • 6 × 0 = 0
  • 5 × (7 + 16) = (5 × 7) + (5 × 16) (correct)

What is the sign of the quotient when both the dividend and divisor are negative?

  • Negative
  • Positive (correct)
  • Undefined
  • Zero

What is the product of any rational number and 1?

<p>The rational number itself (C)</p> Signup and view all the answers

What is the result of dividing 0 by -10?

<p>0 (B)</p> Signup and view all the answers

According to the properties of multiplication, what is the value of 6 × 0?

<p>0 (B)</p> Signup and view all the answers

Which of the following expressions demonstrates the commutative property of multiplication?

<p>4 × 3 = 3 × 4 (C)</p> Signup and view all the answers

When dividing a positive number by a negative number, what will the quotient's sign be?

<p>Negative (B)</p> Signup and view all the answers

If the absolute values of the dividend and divisor are 10 and 2 respectively, what is the quotient?

<p>5 (D)</p> Signup and view all the answers

Using the distributive property, what would be the result of 3 × (4 + 5)?

<p>27 (A), 27 (B), 27 (C), 27 (D)</p> Signup and view all the answers

What is the result of (0.67 × 0.8) × 0?

<p>0 (C)</p> Signup and view all the answers

What is the numerical coefficient of the term $2x - 3$?

<p>2 (D)</p> Signup and view all the answers

What is the reciprocal of -7?

<p>-1/7 (C)</p> Signup and view all the answers

Which property allows you to rewrite 4(2 + 3) as 4 × 2 + 4 × 3?

<p>Distributive property (A)</p> Signup and view all the answers

Which operation is equivalent to dividing a rational number by another non-zero rational number?

<p>Multiplying by the reciprocal of the divisor (C)</p> Signup and view all the answers

Which of the following represents an equation?

<p>$2x + 10 = 5x + 60$ (C)</p> Signup and view all the answers

What will be the result of dividing any non-zero number by 0?

<p>Undefined (A)</p> Signup and view all the answers

What is the quotient of -10 and 2?

<p>-5 (B)</p> Signup and view all the answers

Which of the following expressions is an algebraic expression?

<p>$3x$ (D)</p> Signup and view all the answers

Identify the numerical coefficient of $-3x^2$.

<p>-3 (B)</p> Signup and view all the answers

Which term represents a like term with $4x$?

<p>$2x$ (C)</p> Signup and view all the answers

Which of the following examples correctly represents like terms?

<p>-80a^2b^2 and -10a^2b^2 (A)</p> Signup and view all the answers

Which of the following expressions is not an equation?

<p>$2x + 10$ (D)</p> Signup and view all the answers

What is the numerical coefficient in the expression -5xy?

<p>-5 (D)</p> Signup and view all the answers

What does the equation $2(\mathcal{R} + w)$ represent?

<p>A linear equation in two variables (A)</p> Signup and view all the answers

Which term is considered an unlike term to the term 3x?

<p>3x^2 (A)</p> Signup and view all the answers

What defines a constant in an algebraic expression?

<p>A term that does not change its value. (A)</p> Signup and view all the answers

Which of the following is an example of an algebraic expression?

<p>5x - 4 (C)</p> Signup and view all the answers

What differentiates terms in Group A from those in Group B?

<p>Terms in Group A are like terms, whereas those in Group B are unlike terms. (A)</p> Signup and view all the answers

What is an example of a term?

<p>3y^2 (B)</p> Signup and view all the answers

Which expression represents an equation?

<p>2x + 5 = 15 (D)</p> Signup and view all the answers

What is the result of simplifying the expression 7x + 5x?

<p>12x (B)</p> Signup and view all the answers

What is the result of simplifying the expression $3x + 2(7x + 5)$ using the distributive and associative properties?

<p>$17x + 10$ (C)</p> Signup and view all the answers

Which of the following correctly represents the division of two rational numbers?

<p>a ÷ b = c if and only if c × b = a (D)</p> Signup and view all the answers

What is the quotient when dividing 12 by 4?

<p>3 (A)</p> Signup and view all the answers

In the expression $3x - 7(2x + 10)$, what property is primarily used when rewriting it as $3x + (-7)(2x + 10)$?

<p>Distributive property (D)</p> Signup and view all the answers

What is the simplified form of the expression 6x + (-5 + 8)?

<p>6x + 3 (D)</p> Signup and view all the answers

What is the final simplified form of $3x - 7(2x + 10)$?

<p>$-11x - 70$ (C)</p> Signup and view all the answers

In the expression 4[3 + 2(x + 5)], what is the first step to simplifying it?

<p>Distribute 4 across each term inside the brackets. (A)</p> Signup and view all the answers

Which property allows the computation of the expression $2(x + 2y) + 3y$ to be restructured to $2x + 4y + 3y$?

<p>Distributive property (D)</p> Signup and view all the answers

What is the simplified result of the expression $2(x + 2y) + 3y$?

<p>$2x + 7y$ (B)</p> Signup and view all the answers

Which of the following represents the correct expansion of x(x + 3) + 2(x + 5)?

<p>x^2 + 5x + 10 (D)</p> Signup and view all the answers

In the operation of division, what term is referred to as the divisor?

<p>The number used to divide (A)</p> Signup and view all the answers

Which statement about multiplying negative factors is true?

<p>An even number of negative factors results in a positive product. (B)</p> Signup and view all the answers

What happens when a rational number is multiplied by -1?

<p>It becomes its opposite. (A)</p> Signup and view all the answers

Which statement correctly defines the term 'quotient' in the division a ÷ b = c?

<p>The total result of the division (C)</p> Signup and view all the answers

If a product of rational numbers has at least one factor that is zero, what is the product?

<p>Zero (D)</p> Signup and view all the answers

Flashcards

Combining Like Terms

Adding or subtracting terms with the same variable and exponent.

Distributive Property

Multiplying a number outside parentheses by each term inside the parentheses.

Simplifying Expressions

Combining like terms and applying the distributive property to simplify expressions.

Inverse Operations

Operations that undo each other.

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Division of Rational Numbers

Finding the quotient of two rational numbers.

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Dividend

The number being divided.

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Divisor

The number that divides another number.

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Quotient

The result of a division.

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Term

A constant, a variable, or a product of a number and a variable.

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Like Terms

Terms having the same variables raised to the same powers but may differ in their numerical coefficients.

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Unlike Terms

Terms that do not have the same variables or exponents of variables.

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Numerical Coefficient

The numerical factor that multiplies a variable in a term.

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Equation

A statement of equality between two expressions.

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What are Equivalent Equations?

Equations that have the same solution(s).

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Algebraic Expression

A combination of variables, constants, and arithmetic operations.

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What are Equivalent Transformations?

Operations that change the form of an equation or inequality, but maintain the solution(s).

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Commutative Property of Multiplication

The order of factors doesn't change the product. For any rational numbers 'a' and 'b', a × b = b × a.

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Associative Property of Multiplication

Grouping of factors doesn't change the product. For any rational numbers 'a', 'b', and 'c', a × (b × c) = (a × b) × c.

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Distributive Property of Multiplication

Multiplying a sum by a number is the same as multiplying each addend by the number and then adding the products. For any rational numbers 'a', 'b', and 'c', a × (b + c) = (a × b) + (a × c).

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Property of 0 in Multiplication

Any number multiplied by zero equals zero. For any rational number 'a', a × 0 = 0.

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Property of 1 in Multiplication

Any number multiplied by one equals itself. For any rational number 'a', a × 1 = a.

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Multiplication with Fractions

To multiply fractions, multiply the numerators and the denominators.

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Multiplication with Decimals

To multiply decimals, multiply as if they were whole numbers and then count the total decimal places in the factors to place the decimal point in the product.

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Sign Rule for Division

If the signs of the dividend and divisor are the same, the quotient is positive (+). If the signs are different, the quotient is negative (-).

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Absolute Value in Division

To find the absolute value of the quotient, divide the absolute value of the dividend by the absolute value of the divisor.

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Reciprocal of a Rational Number

The reciprocal of a rational number is found by inverting the numerator and denominator.

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Division by Zero

Division by zero is undefined in the set of rational numbers.

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Dividing a Rational Number by Another

Multiplying the dividend by the reciprocal of the divisor.

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Example: 28 ÷ 4

Both the dividend (28) and divisor (4) are positive. The quotient is 7 because 28 ÷ 4 = 7.

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Example: -10 ÷ 2

The dividend (-10) is negative and the divisor (2) is positive. The quotient is -5 because 10 ÷ 2 = 5, and the signs are different.

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What is the numerical coefficient of -x²?

The numerical coefficient of -x² is -1. Coefficients are the numbers that multiply variables. In this case, the coefficient is -1 because it's essentially -1 * x².

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Identify like terms: 3x², -5x², 2y, 7x

The like terms are 3x² and -5x². They both have the same variable (x) and the same exponent (2).

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Identify unlike terms: 3x², -5y³, 2x, 7y

All of these terms are unlike because they either have different variables or different exponents.

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Associative Property of Addition

The order in which you add three or more numbers does not affect the sum. (a + b) + c = a + (b + c)

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Multiplication by -1

Multiplying any number by -1 results in its opposite. -1 × a = -a

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Product of Negative Factors

An even number of negative factors results in a positive product. An odd number of negative factors results in a negative product.

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Simplifying Expressions: Distributive Property First

When simplifying expressions involving parentheses, use the Distributive Property first to remove the parentheses.

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Simplifying Expressions: Combine Like Terms

After distributing, combine terms with the same variable and exponent. Use the Associative and Distributive Properties.

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Study Notes

Mathematics Grade 7 Student Textbook

  • This textbook is for Grade 7 students in Ethiopia.
  • It was funded by the General Education Quality Improvement Project (GEQIP).
  • International Development Associations (IDA) and other development partners, including Finland, Italian Development Cooperation, the Netherlands and UK aid from the Department for International Development (DFID), contributed to the funding.
  • The book was developed by Al Ghurair Printing and Publishing House CO. (LLC) in collaboration with Kuraz International Publisher P.L.C.
  • The ISBN for the book is 978-99944-2-054-4.

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