Name _______________________________________ Date __________________ Class _________________
LESSON
4-7
Practice B
The Real Numbers
Write all names that apply to each number.
1. −
7
8
2.
18
2
3.
0.15
________________________
________________________
________________________
________________________
________________________
________________________
4.
5. −25
45
6. −6.75
________________________
________________________
________________________
________________________
________________________
________________________
State if the number is rational, irrational, or not a real number.
7.
14
8.
_______________
11.
7
20
9.
!16
________________
10.
________________
12. − 81
_______________
6.2
0
13.
________________
7
9
49
________________
14. −1.3
________________
________________
Find a real number between each pair of numbers.
15. 7
3
4
and 7
5
5
________________________
16. 6.45 and
13
2
17.
________________________
18. Give an example of a rational number between − 4 and
7
9
and
8
10
________________________
4
________________________________________________________________________________________
19. Give an example of an irrational number less than 0.
________________________________________________________________________________________
20. Give an example of a number that is not real.
________________________________________________________________________________________
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Holt McDougal Mathematics
LESSON 4-7
Practice A
1.
3.
4.
5.
6.
7.
9.
11.
13.
Practice C
1. rational; real
2. irrational; real
3. not real
4. integer; rational; real
5. irrational; real
6. rational; real
7. integer; rational; real
8. natural; whole; integer; rational; real
9. irrational; real
10–13.
17. sample answer: 7
50
18. sample answer:
5
19. sample answer:
!25
7
20. sample answer: 2
0
rational; real
2. rational; real
irrational; real
natural; whole; integer; rational; real
integer; rational; real
natural; whole; integer; rational; real
rational
8. irrational
not real
10. not real
rational
12. rational
rational
14. irrational
15. sample answer: 3 1
2
16. sample answer: 2.18
14. sample answer: 1.2
15. sample answer: 23
24
16. sample answer: −0.26
20. sample answer: 3
4
17. sample answer:
41
50
18. sample answer: 5.3
Practice B
1.
3.
4.
5.
6.
8.
10.
12.
14.
22
19. sample answer: −
Review for Mastery
rational; real
2. irrational; real
natural; whole; integer; rational; real
irrational; real
integer; rational; real
rational; real
7. irrational
not real
9. not real
rational
11. rational
rational
13. irrational
rational
1. irrational
2. rational
3. rational
4. irrational
5. real
6. real
7. not real
8. not real
Possible answers are shown.
9. 8 1
2
11. − 3 1
2
15. sample answer: 7 7
10
16. sample answer: 6.48
10. −1.65
12. 6 5
8
Challenge
1. 24 is not perfect since 1 + 2 + 3 + 4 +
6 + 8 + 12 ≠ 24.
17. sample answer: 22
25
18. sample answer: 0
28 is perfect since 1 + 2 + 4 + 7 + 14 =
28.
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
91
Holt McDougal Mathematics