Math Gr 8 Ch 1: Calculations using Whole Numbers
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Questions and Answers

What is the purpose of estimating in calculations?

  • To simplify subtraction problems
  • To make quick decisions and check the reasonableness of results (correct)
  • To avoid doing precise calculations
  • To get an exact answer

    • When estimating products, what is a good rule of thumb?

  • Round to the nearest ten
  • Round to the nearest thousand (correct)
  • Round to the nearest million
  • Round to the nearest hundred

    • What is the main advantage of using column addition?

  • It helps with subtraction problems
  • It makes addition easier and more accurate (correct)
  • It simplifies multiplication
  • It helps with estimating

    • What is the purpose of compensating when rounding off numbers?

    <p>To adjust for rounding errors</p> Signup and view all the answers

    What is the borrowing technique used for in subtraction?

    <p>To rearrange parts to make subtraction easier</p> Signup and view all the answers

    What is the main advantage of using multiplication in parts?

    <p>It breaks down the multiplication into smaller parts</p> Signup and view all the answers

    What is the purpose of carrying over in multiplication?

    <p>To write down the partial product and carry over extra values to the next column</p> Signup and view all the answers

    What is the main advantage of using long division?

    <p>It breaks down the division into smaller, manageable steps</p> Signup and view all the answers

    What is the benefit of rounding numbers to the nearest ten, hundred, or thousand?

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

    When using column addition, what do you do when the sum of a column is greater than the place value?

    <p>Carry over the extra value to the next column</p> Signup and view all the answers

    What is the purpose of breaking down numbers into parts in multiplication?

    <p>To multiply each part separately and add the results</p> Signup and view all the answers

    What do you do when subtracting corresponding parts of the numbers in subtraction by parts?

    <p>Subtract the corresponding parts</p> Signup and view all the answers

    What is the purpose of using expanded notation in addition?

    <p>To break down numbers into parts and add each part separately</p> Signup and view all the answers

    What do you do when the divisor is greater than the dividend in long division?

    <p>Write a zero in the quotient and bring down the next digit</p> Signup and view all the answers

    What is the benefit of using multiples of a thousand when estimating products?

    <p>To simplify the product</p> Signup and view all the answers

    What do you do when the result of a calculation is not reasonable?

    <p>Check the calculation for errors</p> Signup and view all the answers

    When estimating sums, what would be the most accurate way to simplify the calculation?

    <p>Round numbers to the nearest hundred</p> Signup and view all the answers

    What is the primary advantage of using the column addition method?

    <p>It ensures accurate calculations with large numbers</p> Signup and view all the answers

    When using the multiplication in parts method, what should you do with the partial products?

    <p>Add them together to get the final answer</p> Signup and view all the answers

    What is the primary purpose of breaking down numbers into parts in subtraction?

    <p>To simplify the calculation</p> Signup and view all the answers

    When using long division, what should you do when the remainder is greater than the divisor?

    <p>Bring down the next digit</p> Signup and view all the answers

    What is the main advantage of using expanded notation in addition?

    <p>It makes it easier to add large numbers</p> Signup and view all the answers

    When compensating for rounding errors, what should you do?

    <p>Subtract the rounding error from the estimate</p> Signup and view all the answers

    What is the primary purpose of using the borrowing technique in subtraction?

    <p>To simplify the subtraction process</p> Signup and view all the answers

    When estimating the sum of 542 and 279, what is the best approach?

    <p>Round 542 to 500 and 279 to 300</p> Signup and view all the answers

    What is the primary reason for compensating when rounding off numbers?

    <p>To correct for the error introduced by rounding</p> Signup and view all the answers

    When using the multiplication in parts method, what should be done with the partial products?

    <p>Add them together to get the final result</p> Signup and view all the answers

    What is the primary advantage of using column subtraction?

    <p>It helps to organize the numbers by place value</p> Signup and view all the answers

    When using long division, what should be done when the remainder is zero?

    <p>Stop the division and write the result</p> Signup and view all the answers

    What is the main advantage of using expanded notation in addition?

    <p>It helps to organize the numbers by place value</p> Signup and view all the answers

    When estimating the product of 47 and 219, what is the best approach?

    <p>Round 47 to 50 and 219 to 200</p> Signup and view all the answers

    What is the primary purpose of breaking down numbers into parts in subtraction?

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

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