Idiot\'s Guides Basic Math and Pre-Algebra

APPENDIX

B Extra Practice Answers

Part I: Arithmetic

You used the number 8,472,019 to answer

questions 1–5.

1. 0 is in the hundreds place.


2. 4 is in the hundred-thousands place.


3. 2 is in the thousands place.


4. 1 is in the tens place.


5. 8 is in the millions place.


6. 7,300 = 7.3 v 103


7. 12,000 = 1.2 v 104


8. 903 = 9.03 v 102


9. 2,450,000 = 2.45 v 106


10. 691,000 = 6.91 v 105


11. 8 v 3 + 5^2 = 24 + 25 = 49


12. 27 – 8 z 4 v 10 = 27 – 2 v 10 =27 – 20 = 7


13. 4(7 -3) – 3(7 – 4) = 4(4) – 3(3) = 16 – 9 = 7


14. (56 – 8) z 4 – 10 = 48 z 4 – 10 = 12 – 10
    = 2
    15. 8 v (3 + 5)^2 = 8 v (8)^2 = 8 v 64 = 512
    16. -19 + 39 z -3 = -19 + -13 = -32
    17. -5(-4 + -8) + 5(4 + 7) = -5(-12) + 5(11) =
    60 + 55 = 115
    18. (16 – 37) z -7 = -21 z -7 = 3
    19. 20 v -3 + (-7)^2 = 20 v -3 + 49 = 60 – 49 =
    11
    20. 17 – 33 – 9(12 – 8) = 17 – 33 – 9(4)
    = 17 – 33 – 36 = -16 – 36 = -52
    21. 280 = 2^3 v 5 v 7
    22. 5,005 = 5 v 7 v 11 v 13
    23. 510 = 2 v 3 v 5 v 17 and 272 = 2^4 v 17
    GCF = 2 v 17 = 3 4
    24. 91 = 7 v 13 and 119 = 7 v 17
    LCM = 7 v 13 v17 = 1,547
    25. 42 = 2 v 3 v 7 and 90= 2 v 32 v 5
    GCF = 2 v 3 = 6 and
    LCM = 2 v 32 v 5 v 7 = 630