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Rounding Decimal Numbers

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Rounding Decimal Numbers

  1. 1. Rounding Decimal Numbers<br />
  2. 2. Round Off Whole Numbers<br />Remember<br />Round 23 to the nearest tens.<br />Step 1. Underline the digit in the given place. (tens)<br />23<br />Step 2. Circle the number to its right.<br />23<br />Step 3. (a) 3 is less than 5 so the digit in the given place <br /> (tens) remains the same.<br />23<br />Step 4. Replace all digits to the right of the given place with zeros.<br />20<br />23, rounded to the nearest ten is 20<br />
  3. 3. Round Off Whole Numbers<br />Remember<br />Round 146 to the nearest tens.<br />Step 1. Underline the digit in the given place. (tens)<br />Step 2. <br />Step 3. <br />Step 4<br />146, rounded to the nearest ten is<br />
  4. 4. Round Off Whole Numbers<br />Remember<br />Round 273 to the nearest hundreds.<br />Step 1. Underline the digit in the given place. <br />Step 2. <br />Step 3. <br />Step 4. <br />273, rounded to the nearest hundred is<br />
  5. 5. Round Off Whole Numbers<br />Remember<br />Round 995 to the nearest hundreds.<br />Step 1. Underline the digit in the given place. <br />Step 2. <br />Step 3. <br />Step 4. <br />890, rounded to the nearest hundred is<br />
  6. 6. Rounding Decimal Numbers<br />Round 5.73 to the nearest tenth (1 decimal place or 1dp).<br />Step 1. Underline the digit in the given place. (tenths)<br /> 5.73<br />Step 2. Circle the number to its right.<br /> 5.73<br />Step 3. (a) 3 is less than 5 so the digit in the given place <br /> (tenths) remains the same.<br /> 5.7 <br />Step 4. When rounding decimals, DELETE all digits to the right of the given place.<br /> 5.7<br />5.73, rounded to the nearest tenth is 5.7<br />
  7. 7. Rounding Decimal Numbers<br />Round 2.13 to the nearest tenth (1 decimal place or 1dp).<br />Step 1. Underline the digit in the given place. (tenths)<br />Step 2. <br />Step 3. <br />Step 4. <br />2.13, rounded to the nearest tenth is<br />
  8. 8. Rounding Decimal Numbers<br />Round 6.378 to the nearest hundredth (2 decimal places or 2dp)..<br />Step 1. Underline the digit in the given place. (HUNDREDTHS)<br /> 6.378<br />Step 2. Circle the number to its right.<br /> 6.37 8<br />Step 3. (a) 8 is more than 5 so we add 1 to the hundredths place.<br />8<br /> 6.378 <br />Step 4. When rounding decimals, DELETE all digits to the right of the given place.<br /> 6.38<br />6.378, rounded to the nearest hundredth is 6.38.<br />
  9. 9. Rounding Decimal Numbers<br />Round 9.647 to the nearest hundredth (2 decimal places or 2dp).<br />Step 1. Underline the digit in the given place. (HUNDREDTHS)<br />Step 2. <br />Step 3. <br />Step 4. <br />9.674, rounded to the nearest hundredth is<br />
  10. 10. Rounding Decimal Numbers<br />Round 1.4252 to the nearest thousandth (3 decimal place or 3dp).<br />Step 1. Underline the digit in the given place. (thousandths)<br /> 1.4252<br />Step 2. Circle the number to its right.<br /> 1.4252<br />Step 3. (a) 2 is less than 5 so the digit in the given place <br /> (thousandths) remains the same.<br /> 1.425 <br />Step 4. When rounding decimals, DELETE all digits to the right of the given place.<br /> 1.425<br />1.4252, rounded to the nearest thousandth is 1.425<br />
  11. 11. Rounding Decimal Numbers<br />Round 7.4318 to the nearest thousandth (3 decimal place or 3dp).<br />Step 1. Underline the digit in the given place. (thousandths)<br />Step 2. <br />Step 3. <br />Step 4. <br />7.4318, rounded to the nearest thousandth is<br />
  12. 12. Rounding Decimal Numbers<br />Now do pages 96, rounding to the nearest………….<br />Do page 97, rounding to ….. decimal places<br />
  13. 13. Rounding Decimal Numbers<br />Now do pages 96, rounding to the nearest………….<br />
  14. 14. Rounding Decimal Numbers<br />Do page 97, rounding to ….. decimal places<br />
  15. 15. Rounding Decimal Numbers<br />9+1= 10<br />5+1 = 6<br />
  16. 16. Rounding Decimal Numbers<br />9 + 1 = 10<br />2 + 1 = 3<br />
  17. 17. Rounding Decimal Numbers<br />9 + 1 = 10<br />9 + 1 = 10<br />6+1 = 7<br />
  18. 18. Rounding Decimal Numbers<br />Now do pages 100, 101 rounding to ….. decimal places, to the nearest………….<br />Do page 102, 104 rounding<br />
  19. 19. Page 100<br />
  20. 20. Try These 4<br />Page 100<br />
  21. 21. Page 101<br />Try These 5<br />Round the numbers to the place indicated.<br />
  22. 22. Page 102<br />
  23. 23. Page 104<br />
  24. 24. Rounding Decimal Numbers<br />Complete Exercise 3.2 <br />on<br />pages 105 and 106<br />
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  28. 28. . Round each number as indicated.<br />a. 4.231 to 2 decimal places ____________<br />b. 0.75 to 1 decimal place ____________<br />c. 2.076 to 2 decimal places ___________<br />d. 0.698 to 2 decimal places ____________<br />e. 23.357 to 1 decimal place ____________<br />f. 48.6929 to 3 decimal places____________<br />g. 639.678 to the nearest hundred ____________<br />h. 12.364 to the nearest ten ____________<br />i. 95.89 to the nearest ten ____________<br />j. 5783.22 to the nearest hundred ____________<br />

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