TEST BANK FOR
CALCULATE WITH
CONFIDENCE 9TH EDITION
BY DEBORAH GRAY
MORRIS, ALL CHAPTERS 1-
24 LATEST
Calculate with Confidence, 9th Edition
Practice Examination — Morris (2026)
ISBN: 9780443127328 | All Chapters 1–24 | Questions 1–50
Instructions: This examination consists of multiple-choice questions drawn from the
Test Bank for the 9th Edition. Each question is followed by the correct answer and a
detailed rationale.
UNIT ONE: MATH REVIEW (Chapters 1–4)
Question 1
Reduce the fraction 24/36 to lowest terms.
,A. 2/3
B. 3/4
C. 4/6
D. 12/18
Answer: A
Rationale: To reduce 24/36 to lowest terms, divide both the numerator and
denominator by their greatest common divisor, which is 12. 24 ÷ 12 = 2; 36 ÷ 12 = 3.
The reduced fraction is 2/3.
Question 2
Perform the indicated operation and reduce to lowest terms: 3/8 + 1/6.
A. 4/14
B. 13/24
C. 1/2
D. 4/24
Answer: B
Rationale: To add fractions with different denominators, find the least common
denominator (LCD). The LCD of 8 and 6 is 24. Convert: 3/8 = 9/24; 1/6 = 4/24. Add
numerators: 9 + 4 = 13. The answer is 13/24.
Question 3
Which fraction is the largest?
A. 3/4
B. 5/8
C. 2/3
D. 7/12
Answer: A
,Rationale: Convert all fractions to decimals or find a common denominator. 3/4 = 0.75;
5/8 = 0.625; 2/3 ≈ 0.667; 7/12 ≈ 0.583. 3/4 (0.75) is the largest.
Question 4
Change the decimal 0.625 to a fraction in lowest terms.
A. 5/8
B. 6/10
C. 625/1000
D. 25/40
Answer: A
Rationale: 0.625 = 625/1000. Divide numerator and denominator by 125: 625 ÷ 125 =
5; 1000 ÷ 125 = 8. The fraction is 5/8.
Question 5
Solve for x: 3:5 = 12:x.
A. 15
B. 20
C. 25
D. 18
Answer: B
Rationale: In a proportion, cross-multiply: 3 × x = 5 × 12. 3x = 60. x = 20.
Question 6
What is 15% of 240?
A. 24
B. 36
, C. 32
D. 40
Answer: B
Rationale: Convert 15% to a decimal (0.15) and multiply: 0.15 × 240 = 36.
UNIT TWO: SYSTEMS OF MEASUREMENT (Chapters 5–8)
Question 7
Convert 2.5 kilograms to grams.
A. 250 grams
B. 2,500 grams
C. 25,000 grams
D. 0.25 grams
Answer: B
Rationale: To convert kilograms to grams, multiply by 1,000. 2.5 × 1,000 = 2,500 grams.
Question 8
Convert 1,500 milligrams to grams.
A. 15 grams
B. 1.5 grams
C. 0.15 grams
D. 150 grams
Answer: B
Rationale: To convert milligrams to grams, divide by 1,000. 1,500 ÷ 1,000 = 1.5 grams.
CALCULATE WITH
CONFIDENCE 9TH EDITION
BY DEBORAH GRAY
MORRIS, ALL CHAPTERS 1-
24 LATEST
Calculate with Confidence, 9th Edition
Practice Examination — Morris (2026)
ISBN: 9780443127328 | All Chapters 1–24 | Questions 1–50
Instructions: This examination consists of multiple-choice questions drawn from the
Test Bank for the 9th Edition. Each question is followed by the correct answer and a
detailed rationale.
UNIT ONE: MATH REVIEW (Chapters 1–4)
Question 1
Reduce the fraction 24/36 to lowest terms.
,A. 2/3
B. 3/4
C. 4/6
D. 12/18
Answer: A
Rationale: To reduce 24/36 to lowest terms, divide both the numerator and
denominator by their greatest common divisor, which is 12. 24 ÷ 12 = 2; 36 ÷ 12 = 3.
The reduced fraction is 2/3.
Question 2
Perform the indicated operation and reduce to lowest terms: 3/8 + 1/6.
A. 4/14
B. 13/24
C. 1/2
D. 4/24
Answer: B
Rationale: To add fractions with different denominators, find the least common
denominator (LCD). The LCD of 8 and 6 is 24. Convert: 3/8 = 9/24; 1/6 = 4/24. Add
numerators: 9 + 4 = 13. The answer is 13/24.
Question 3
Which fraction is the largest?
A. 3/4
B. 5/8
C. 2/3
D. 7/12
Answer: A
,Rationale: Convert all fractions to decimals or find a common denominator. 3/4 = 0.75;
5/8 = 0.625; 2/3 ≈ 0.667; 7/12 ≈ 0.583. 3/4 (0.75) is the largest.
Question 4
Change the decimal 0.625 to a fraction in lowest terms.
A. 5/8
B. 6/10
C. 625/1000
D. 25/40
Answer: A
Rationale: 0.625 = 625/1000. Divide numerator and denominator by 125: 625 ÷ 125 =
5; 1000 ÷ 125 = 8. The fraction is 5/8.
Question 5
Solve for x: 3:5 = 12:x.
A. 15
B. 20
C. 25
D. 18
Answer: B
Rationale: In a proportion, cross-multiply: 3 × x = 5 × 12. 3x = 60. x = 20.
Question 6
What is 15% of 240?
A. 24
B. 36
, C. 32
D. 40
Answer: B
Rationale: Convert 15% to a decimal (0.15) and multiply: 0.15 × 240 = 36.
UNIT TWO: SYSTEMS OF MEASUREMENT (Chapters 5–8)
Question 7
Convert 2.5 kilograms to grams.
A. 250 grams
B. 2,500 grams
C. 25,000 grams
D. 0.25 grams
Answer: B
Rationale: To convert kilograms to grams, multiply by 1,000. 2.5 × 1,000 = 2,500 grams.
Question 8
Convert 1,500 milligrams to grams.
A. 15 grams
B. 1.5 grams
C. 0.15 grams
D. 150 grams
Answer: B
Rationale: To convert milligrams to grams, divide by 1,000. 1,500 ÷ 1,000 = 1.5 grams.
