APPENDIX

A

Check Point Answers

Chapter 1

1. In the number 3,492, the 9 is worth 9 tens.


2. In the number 45,923,881, the 5 is worth 5
   millions.


3. In the number 842,691, the 6 is worth 6
   hundreds.


4. In the number 7,835,142, the 3 is worth 3
   ten-thousands.


5. In the number 7,835,142, the 7 is worth 7
   millions.


6. 79,038: seventy-nine thousand, thirty-eight


7. 84,153,402: eighty-four million, one hundred
   fifty-three thousand, four hundred two


8. “eight hundred thirty-two thousand, six
   hundred nine” = 832,609


9. “fourteen thousand, two hundred ninety-
   one” = 14,291


10. “twenty-nine million, five hundred three
    thousand, seven hundred eighty-two” =
    29,503,782

11. 10,0 0 0 = 10^4

12. 100,000,000,000 = 10^11

13. 10^7 = 10,000,000

14. 10^12 = 1,000,000,000,000

15. 10^5 = 100,000

16. 59,400 = 5.94 v 104


17. 23,000,000 = 2.3 v 107


18. 
    
    
    
    5. 8 v 109 = 5,800,000,000
    
    
    
    


19. 2.492 v 1015 = 2,492,000,000,000,000


20. 1.2 v 1023 = 1.2 v 10 v 1022 = 12 v 1022 >
    9.8 v 1022


21. 942 } 900


22. 29,348 } 30,000


23. 1,725,854 } 1,700,000


24. 1,725,854 } 1,726,000


25. 1,725,854 } 2,000,000