Pre-Algebra Chapter 9

Prerequisite Skills To be successful in this chapter, you’ll you'll need to master
these skills and be able to apply them in problem-solving situations. Review
these skills before beginning Chapter X. 9.
For Lesson 9-2
Compare Decimals
Replace each with , , or to make a true statement. (For review, see page 710.)
1. 3.2 3.5 2. 7.8 7.7 3. 5.13 5.16 4. 4.92 4.89
5. 2.62 2.6 6. 3.4 3.41 7. 0.07 0.7 8. 1.16 1.06
For Lessons 9-4 and 9-7
Solve Equations by Dividing
ALGEBRA Solve each equation. (For review, see Lesson 3-4.)
9. 3x 24 10. 7y 49 11. 120 2n 12. 54 6a
13. 90 10m 14. 144 12m 15. 15d 165 16. 182 14w
For Lesson 9-6
Exponents
Find the value of each expression. (For review, see Lesson 4-2.)
17. (3 1) 2 (4 2) 2 18. (5 2) 2 (6 3) 2 19. (4 7) 2 (3 8) 2
20. (8 2) 2 (3 9) 2 21. (2 6) 2 [(8) 1] 2 22. (7 2) 2 [3 (4)] 2
Make this Foldable to help you organize information about
real numbers and right triangles. Begin with three plain
sheets of 8 1 " by 11" paper.
2
Fold
Repeat
Fold to make
a triangle. Cut off
extra paper.
Repeat
Step 1 twice.
You have three
squares.
Stack and Staple
Label
Stack the three
squares and staple
along the fold.
Label each
section with a
lesson number.
Right
Triangles
Reading and Writing As you read and study the chapter, fill the pages with
examples, diagrams, and formulas.
Chapter 9 Real Numbers and Right Triangles 435