Gr 10 Math Lit: Ch 1.3 Rounding, Ratio, Rates and Persentages
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Questions and Answers

What is the primary purpose of estimating in mathematics?

  • To compare large numbers
  • To use a calculator effectively
  • To think about a problem before solving it (correct)
  • To get an exact answer to a problem

    • What is the term for a standard way of doing something in mathematics?

  • Format
  • Place value
  • Convention (correct)
  • Number representation

    • What separates whole numbers from decimal fractions in South African number representation?

  • Line
  • Comma (correct)
  • Decimal point
  • Space

    • What type of numbers are used for counting objects?

    <p>Counting numbers</p> Signup and view all the answers

    What is the purpose of using a place value table when comparing numbers?

    <p>To understand the size of numbers</p> Signup and view all the answers

    What is the correct order of operations when using brackets in a mathematical expression?

    <p>BODMAS</p> Signup and view all the answers

    What is the primary function of the memory keys on a calculator?

    <p>To store and recall numbers during calculations</p> Signup and view all the answers

    How do you write whole numbers in words?

    <p>Separate numbers into groups of three digits</p> Signup and view all the answers

    What is the main idea behind breaking down and multiplying numbers?

    <p>To break numbers into parts, multiply each part, and add results</p> Signup and view all the answers

    When multiplying a number by 10, 100, or 1000, what do you do to each digit?

    <p>Shift each digit to the left by the number of zeros in the multiplier</p> Signup and view all the answers

    What is the definition of a proper fraction?

    <p>A fraction where the numerator is less than the denominator</p> Signup and view all the answers

    What operation is used to convert a decimal fraction to a common fraction?

    <p>Division</p> Signup and view all the answers

    What is the main purpose of using positive and negative numbers?

    <p>To represent values below zero, such as debts or temperatures</p> Signup and view all the answers

    What is the rule for rounding a number to the nearest 10?

    <p>Numbers with units digits 1-4 round down, 5-9 round up</p> Signup and view all the answers

    What is the definition of a ratio?

    <p>A comparison of two or more numbers of the same type</p> Signup and view all the answers

    How do you calculate a percentage value?

    <p>By converting the percentage to a decimal and then multiplying it by the given amount</p> Signup and view all the answers

    What is the main function of a place value table in mathematics?

    <p>To compare and order numbers</p> Signup and view all the answers

    In which situation would you use a decimal comma?

    <p>When separating whole numbers from decimal fractions</p> Signup and view all the answers

    What is the main purpose of using brackets in a mathematical expression?

    <p>To indicate the order of operations</p> Signup and view all the answers

    When would you use counting numbers?

    <p>When counting objects</p> Signup and view all the answers

    What is the purpose of using spaces in South African number representation?

    <p>To group digits in thousands</p> Signup and view all the answers

    What is the main function of the 'On/Off' key on a calculator?

    <p>To turn the calculator on and off</p> Signup and view all the answers

    What is the purpose of using order numbers?

    <p>To indicate the order or position of something</p> Signup and view all the answers

    What is the main purpose of using percentage rates?

    <p>To represent rates like unemployment or inflation</p> Signup and view all the answers

    What is the purpose of grouping in multiplication?

    <p>To make calculations easier</p> Signup and view all the answers

    What operation is used to convert a common fraction to a decimal fraction?

    <p>Division</p> Signup and view all the answers

    What is the purpose of using unit rates in ratio calculations?

    <p>To find the unit rate of a given quantity</p> Signup and view all the answers

    What is the result of multiplying a number by 10, 100, or 1000?

    <p>The digits are shifted to the left</p> Signup and view all the answers

    What is the definition of a mixed number?

    <p>A whole number combined with a fraction</p> Signup and view all the answers

    What is the purpose of rounding numbers in real-life situations?

    <p>To consider the practical implications of the calculation</p> Signup and view all the answers

    What is the definition of a rate?

    <p>A comparison of two numbers with different units</p> Signup and view all the answers

    What is the formula to calculate a percentage value?

    <p>Percentage = fraction × given amount</p> Signup and view all the answers

    Which type of number would be used to represent the position of a runner in a race?

    <p>Order Number</p> Signup and view all the answers

    What is the purpose of using the 'Memory Functions' keys on a calculator?

    <p>To store and recall numbers during calculations</p> Signup and view all the answers

    In which situation would you use a decimal point?

    <p>When writing international measurements</p> Signup and view all the answers

    What is the purpose of using brackets in a mathematical expression according to the Order of Operations?

    <p>To indicate the order of operations</p> Signup and view all the answers

    What is the purpose of using spaces in South African number representation?

    <p>To separate groups of three digits</p> Signup and view all the answers

    What is the purpose of using codes in numbers?

    <p>To identify objects or people</p> Signup and view all the answers

    What is the purpose of using a place value table when comparing numbers?

    <p>To compare numbers by place value</p> Signup and view all the answers

    Which of the following is an example of a situation where you would use percentage rates?

    <p>Representing the rate of unemployment</p> Signup and view all the answers

    When multiplying a number by 10^x, what happens to the digits of the original number?

    <p>Each digit is shifted to the left by x places</p> Signup and view all the answers

    What is the purpose of converting fractions to decimal fractions?

    <p>To represent parts of a whole in a more familiar way</p> Signup and view all the answers

    When adding or subtracting fractions, what is the first step?

    <p>Convert fractions to a common denominator</p> Signup and view all the answers

    What is the relationship between opposite numbers?

    <p>They are equal distances from zero but on opposite sides</p> Signup and view all the answers

    What is the purpose of using unit rates in ratio calculations?

    <p>To compare ratios with different units</p> Signup and view all the answers

    What is the result of multiplying a number by -1?

    <p>The number becomes negative</p> Signup and view all the answers

    What is the purpose of using proportions in real-life situations?

    <p>To represent the relationship between two ratios</p> Signup and view all the answers

    What is the purpose of using contextual rounding in real-life situations?

    <p>To consider the practical implications of rounding</p> Signup and view all the answers

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