Home
Add Document
Sign In
Register
Answer Key
Home
Answer Key
663.23. 14. 26.36. 15. 26.46. 16. 521.76. 2.2. Estimate Decimal Sums and Differences Using Front End Estimation. Answers. 1. 48. 2. 60. 3. 86. 4. 68. ...
0 downloads
39 Views
117KB Size
DOWNLOAD
Recommend Documents
No documents
Answer Key
Chapter 2 – Using Rational Numbers 2.1
Add and Subtract Decimals
Answers 1. 19.72
2. 31.55
3. 35.734
4. 14.5
5. 13.36
6. 91.34
7. 131.29
8. 136.15
9. 23.33
10. 64.75
11. 75.66
12. 217.8
13. 663.23
14. 26.36
15. 26.46
16. 521.76
2.2
Estimate Decimal Sums and Differences Using Front End Estimation
Answers 1. 48
2. 60
3. 86
4. 68
5. 31
6. 9
7. 115
8. 35
9. 47
10. 45
11. 24
12. 291
13. 27
14. 15
15. 2
2.3
Multiply and Divide Decimals With and Without Rounding
Answers 1. 9
2. 32
3. 49
4. 80
5. 30
6. 30
7. 72
8. 40
9. 72
10. 160
11. 11
12. 4
13. 4
14. 2
15. 7
16. 6
17. 7
18. 5
19. 2
20. 2
21. 6.2
22. 3.5
23. 32.76
24. 28.81
25. .9177
2.4
Estimate Decimal Products and Quotients Using Leading Digits
Answers 1. 7
2. 55
3. 3
4. 36
5. 4
6. 39
7. 3
8. 24
9. 32
10. 2
11. 3
12. 9
13. 81
14. 136
15. 42
16. 42
17. 12
CK‐12 Middle School Math Concepts ‐ Grade 8
1
Answer Key
Chapter 2 – Using Rational Numbers 2.5
Identify and Apply Number Properties in Decimal Operations
Answers 1. 19.5
2. 12.9
3. 9.2
4. 22.3
5. 31.31
6. 66.2
7. 12.1
8. 8.5
9. 16.35
10. 31.1
11. 6.4x + 12.8
12. 15.6x – 10.4
13. 25.2y + 25.2
14. 19.8a – 2.2
15. 53.6x + 60.3
2.6
Add and Subtract Fractions and Mixed Numbers
Answers 1. 2/3
2. 3/5
3. 7/10
4. 5/6
5. 5/8
6. 13/20
7. ¾
8. 1/3
9. 1/3
10. 3/5
11. 4/9
12. 3/5
13. 5 ½
14. 5 3/5
15. 8 5/6
16. 7 3/5
17. 2 1/3
18. 7 ¾
19. 11
20. 10 ½
2.7
Estimate Sums and Differences of Fractions and Mixed Numbers
Answers 1. 1
2. 1 ½
3. 7
4. 2
5. 1
6. ½
7. 0
8. 5
9. 2
10. 26
11. 23
12. ½
13. 0
14. 3
15. 27 ½
2.8
Multiply and Divide Fractions and Mixed Numbers
Answers 1. 3/8
2. 5/8
3. 1/18
4. 25/36
5. 7/24
6. 8/27
7. 4/11
8. 3/5
9. 2/7
10. 1 ½
11. 2 ½
12. 1 7/9
13. 1 7/8
14. 2 2/3
15. 1
16. 1
17. 1 5/7
18. 2 ½
CK‐12 Middle School Math Concepts ‐ Grade 8
2
Answer Key
Chapter 2 – Using Rational Numbers 2.9
Estimate Products and Quotients of Fractions and Mixed Numbers
Answers 1. 1
2. 4
3. 7
4. 24
5. 60
6. 60
7. 21
8. 4
9. 8
10. 4
11. 5
12. 5
13. 3
14. 8
15. 10
2.10
Identify and Apply Number Properties in Fraction Operations
Answers 1. Additive Inverse Property
2. Additive Inverse Property
3. Zero Property
4. Zero Property
5. Multiplicative Inverse
6. Commutative Property
7. Commutative Property
8. Associative Property
9. 1x
10. 1/3x
11. 1x
12. 2 ¼ x
13. 1 9/10
14. 4/15
15. 1 ½ x
2.11
Add and Subtract Integers
Answers 1. 13
2. ‐3
3. 0
4. ‐4
5. 6
6. 5
7. ‐21
8. ‐26
9. ‐23
10. ‐48
11. ‐14
12. ‐15
13. ‐20
14. ‐3
15. ‐5
16. 23
17. 16
18. 32
19. ‐3
20. ‐3
2.12
Multiply and Divide Integers
Answers 1. 48
2. ‐50
3. ‐12
4. ‐12
5. ‐72
6. ‐108
7. ‐88
8. 45
9. 56
10. ‐144
11. ‐6
12. 3
13. ‐2
14. 20
15. 2
16. 7
17. ‐9
18. 5
19. ‐3
20. 34
CK‐12 Middle School Math Concepts ‐ Grade 8
3
Answer Key
Chapter 2 – Using Rational Numbers 2.13
Identify and Apply Number Properties in Integer Operations
Answers 1. Commutative Property
2. Additive Identify Property
3. Associative Property
4. Commutative Property
5. Distributive Property
6. Multiplicative Identity Property
7. Distributive Property
8. y – 20
9. ‐5x + 20
10. 3x + 7 – 3y
11. ‐6y‐24
12. –y + 18
13. 5x + 26
14. ‐45y
15. 5
2.14
Use Simple Interest Equations to Solve Real World Problems
Answers 1. $120
2. ‐120
3. ‐15 + 40 = 30 ft.
4. ‐50 + 5 = ‐45
5. 5 + 20 – x = 7
6. 18
7. ‐15 + ‐5 + ‐ 3.50 = x
8. ‐$23.50
9. yes
10. $6.50
11. ‐3
12. 37 inches
13. 23 inches
14. ‐15 + ‐35 = x
15. ‐50 ft.
2.15
Find Equivalent Forms of Rational Numbers
Answers 1. Yes, Decimal
2. Yes, Fraction
3. Yes, integer
4. Yes, integer
5. yes, integer
6. Yes, repeating decimal
7. No, irrational number
8. yes, terminating decimal
9. Yes, rational number, decimal
10. Yes, fraction
11. 80%
12. 20%
13. 28%
14. 12%
15. 24%
CK‐12 Middle School Math Concepts ‐ Grade 8
4
Answer Key
Chapter 2 – Using Rational Numbers 2.16
Compare and Order Rational Numbers
Answers 1. <
2. >
3. <
4. <
5. <
6. >
7. >
8. >
9. >
10. <
11. 1.5
12. 3
13. ‐59
14. ‐4
15. 5
16. ‐20
2.17
Solve Real World Problems Using Rational Numbers and Simple Equations
Answers 1. 210
2. 372
3. 1,920
4. $138.00
5. $165.50
6. $145.00
7. 8 weeks
8. 12
9. 6 ½ hours
10. L = 90.5 cm
11. 195 cm
12. 172 cm
13. 2,096 sq. cm
14. 480 sq. cm
15. 8 cm
CK‐12 Middle School Math Concepts ‐ Grade 8
5
×
Sign In
Email
Password
Remember me
Forgot password?
Sign In
Login with Facebook
Login with Google