Idiot\'s Guides Basic Math and Pre-Algebra

CHAPTER

21 Extra Practice ...........................................................................

Part I: Arithmetic .....................................................................................................................

Use the number 8,472,019 to answer questions 1–5.

1. Name the digit in the hundreds place.


2. Name the digit in the hundred-thousands
   place.


3. Name the digit in the thousands place.


4. Name the digit in the tens place.


5. Name the digit in the millions place.

Write each number in scientific notation.

6. 7,300


7. 12,000


8. 903


9. 2,450,000


10. 691,000

Evaluate each expression.

11. 8 v 3 + 5^2


12. 27 – 8 z 4 v 10


13. 3(7 – 4) – 4(7 – 3)
    14. (56 – 8) z 4 – 10
    15. 8 v (3 + 5)^2
    16. -19 + 39 z -3
    17. -5(-4 + -8) + 5(4 + 7)
    18. (16 – 37) z -7
    19. 20 v -3 + (-7)^2
    20. 17 – 33 – 9(12 – 8)

Find the following:

21. The prime factorization of 280.


22. The prime factorization of 5,005.


23. The GCF of 510 and 272.


24. The LCM of 91 and 119.


25. The GCF and the LCM of 42 and 90.

Perform each calculation.

26.^15
28
42
3

^

27. 73

5

19

10

4

28.^3
5

4

7