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

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

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

How do you write whole numbers in words?

<p>Separate numbers into groups of three digits (C)</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 (A)</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 (C)</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 (D)</p> Signup and view all the answers

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

<p>Division (C)</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 (B)</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 (A)</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 (B)</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 (B)</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 (A)</p> Signup and view all the answers

In which situation would you use a decimal comma?

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

When would you use counting numbers?

<p>When counting objects (D)</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 (C)</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 (B)</p> Signup and view all the answers

What is the purpose of using order numbers?

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

What is the main purpose of using percentage rates?

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

What is the purpose of grouping in multiplication?

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

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

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

What is the definition of a mixed number?

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

What is the definition of a rate?

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

What is the formula to calculate a percentage value?

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

In which situation would you use a decimal point?

<p>When writing international measurements (A)</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 (B)</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 (C)</p> Signup and view all the answers

What is the purpose of using codes in numbers?

<p>To identify objects or people (C)</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 (D)</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 (B)</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 (D)</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 (C)</p> Signup and view all the answers

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

<p>Convert fractions to a common denominator (D)</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 (B)</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 (C)</p> Signup and view all the answers

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

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

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