Math Lesson 7
Using Very Small and Very Large Numbers

Problems

  Answer Key

Problems  (click HERE for a printer-friendly version)

Directions: Complete the problems below. Consult the Answer Key below for answers once you finish. Review the Instruction material which relates to any questions you do not get correct.

Round off the following numbers:

  1. Round off 7688447.94 to the nearest million: _____
     
  2. Round off 6732312.85 to the nearest hundred thousand: _____
     
  3. Round off 618109.43 to the nearest ten thousand: _____
     
  4. Round off 48822.19 to the nearest thousand: _____
     
  5. Round off 7004.21 to the nearest hundred:  _____
     
  6. Round off 178.4 to the nearest ten:  _____
     
  7. Round off 17.9 to the nearest one: _____
     
  8. Round off 1.587 to the nearest tenth: _____
     
  9. Round off 61.973 to the nearest hundredth: _____
     
  10.  Round off 6130.875 to the nearest thousandth: _____
     
  11. Round off 820.206501 to the nearest ten thousandth: _____
     
  12. Round off 3159.732321 to the nearest hundred thousandth: _____
     

Write these numbers as decimals:

  1. 0.36%
     
  2. 21%
     
  3.  
  1. 85%
     
  2. 72.6%
     
  3. 253.2%
  1. 15%
     
  2. 106%
     
  3. 53% 

 

Write these numbers as fractions:
 

  1. 0.66%
     
  2. 110.8%
     
  3. 25.3%
  1. 0.17%
     
  2. 204.5%
     
  3. 79%
  1. 74%
     
  2.  
     
  3. 61%

 

Solve each problem and write the answer in expanded form:

  1. 72
     
  2. 63
     
  3. 113
     
  4. 112
  1. 103
     
  2. 22
     
  3. 54 × 92
     
  4. 12 + 125 + 123 + 122
  1. 44 + 36
     
  2. 124 + 125
     
  3. 73 + 103
     
  4. 26 × 74
  1. 84 + 44 + 3 + 44
     
  2. 2 + 24
     
  3. 125 + 85 + 53
     
  4. 8 + 2 + 114 + 82

Mark these numbers on the number line:
 

  1.  
     
  2.  
     
  3. 8 
     
  4.  
     
  5. 4 

Answer Key (click HERE for a printer-friendly version) (top) 

  1. 8,000,000
     
  2. 6,700,000
     
  3. 620,000
     
  4. 49,000
     
  5. 7,000
     
  6. 180
     
  7. 18
     
  8. 1.6
     
  9. 61.97
     
  10. 6,130.875
     
  11. 820.2065
     
  12. 3,159.73232
     
  13. 0.0036
     
  14. 0.21
     
  15. 0.392
     
  16. 0.85
     
  17. 0.726
     
  18. 2.532
     
  19. 0.15
     
  20. 1.06
     
  21. 0.535
     
  22.  
     
  23.  
     
  24.  
     
  25.   
     
  26.  
     
  27.  
     
  28.  
     
  29.  
     
  30.  
     
  31. 49
     
  32. 216
     
  33. 1,331
     
  34. 121
     
  35. 1,000
     
  36. 4
     
  37. 50,625
     
  38. 250,716
     
  39. 985
     
  40. 269,568
     
  41. 1,343
     
  42. 153,664
     
  43. 4,611
     
  44. 18
     
  45. 281,725
     
  46. 14,715

47-51: Match the numbers in the problems with the numbers on the number line: