WGU D128 Mathematics for elementary Educators
WGU D128 Mathematics for elementary
Educators Practice Nurse OA Practice
Exam Questions and Answers 2026. 100
MCQs with Rationales
Questions 1–25
Q1
A teacher asks students to identify all factors of 36. Which list is correct?
A. 1, 2, 3, 4, 6, 9, 12, 18, 36
B. 1, 2, 4, 6, 9, 12, 18, 36
C. 2, 3, 4, 6, 9, 12, 18, 36
D. 1, 2, 3, 4, 6, 8, 12, 18, 36
Answer: A
Rationale: Factors divide 36 evenly. The complete set is 1, 2, 3, 4, 6, 9, 12, 18, and 36.
Q2
Which number is prime?
A. 21
B. 27
C. 29
D. 33
Answer: C
Rationale: 29 has exactly two factors: 1 and 29.
Q3
What is the greatest common factor (GCF) of 18 and 24?
, WGU D128 Mathematics for elementary Educators
A. 2
B. 4
C. 6
D. 12
Answer: C
Rationale: Factors common to both are 1, 2, 3, and 6.
Q4
What is the least common multiple (LCM) of 6 and 8?
A. 24
B. 48
C. 12
D. 18
Answer: A
Rationale: 24 is the smallest number divisible by both 6 and 8.
Q5
Convert 0.375 to a fraction.
A. 3/8
B. 37/100
C. 375/1000
D. 5/8
Answer: A
Rationale: 0.375 = 375/1000 = 3/8.
Q6
Which fraction is equivalent to 4/6?
, WGU D128 Mathematics for elementary Educators
A. 1/3
B. 2/3
C. 3/4
D. 4/5
Answer: B
Rationale: Divide numerator and denominator by 2.
Q7
A recipe requires 3/4 cup of sugar. If doubled, how much sugar is needed?
A. 1 cup
B. 1¼ cups
C. 1½ cups
D. 2 cups
Answer: C
Rationale: 3/4 × 2 = 6/4 = 1½.
Q8
What is 5/8 + 1/4?
A. 6/8
B. 7/8
C. 8/8
D. 9/8
Answer: B
Rationale: 1/4 = 2/8; 5/8 + 2/8 = 7/8.
Q9
A number line model is most effective for teaching:
, WGU D128 Mathematics for elementary Educators
A. Prime factorization
B. Fraction magnitude
C. Area formulas
D. Geometry proofs
Answer: B
Rationale: Number lines help students compare fraction sizes.
Q10
Which decimal is largest?
A. 0.45
B. 0.405
C. 0.54
D. 0.504
Answer: C
Rationale: Compare place values.
Q11
A polygon with eight sides is called:
A. Hexagon
B. Heptagon
C. Octagon
D. Nonagon
Answer: C
Q12
The sum of angles in a triangle equals:
A. 90°
B. 180°
WGU D128 Mathematics for elementary
Educators Practice Nurse OA Practice
Exam Questions and Answers 2026. 100
MCQs with Rationales
Questions 1–25
Q1
A teacher asks students to identify all factors of 36. Which list is correct?
A. 1, 2, 3, 4, 6, 9, 12, 18, 36
B. 1, 2, 4, 6, 9, 12, 18, 36
C. 2, 3, 4, 6, 9, 12, 18, 36
D. 1, 2, 3, 4, 6, 8, 12, 18, 36
Answer: A
Rationale: Factors divide 36 evenly. The complete set is 1, 2, 3, 4, 6, 9, 12, 18, and 36.
Q2
Which number is prime?
A. 21
B. 27
C. 29
D. 33
Answer: C
Rationale: 29 has exactly two factors: 1 and 29.
Q3
What is the greatest common factor (GCF) of 18 and 24?
, WGU D128 Mathematics for elementary Educators
A. 2
B. 4
C. 6
D. 12
Answer: C
Rationale: Factors common to both are 1, 2, 3, and 6.
Q4
What is the least common multiple (LCM) of 6 and 8?
A. 24
B. 48
C. 12
D. 18
Answer: A
Rationale: 24 is the smallest number divisible by both 6 and 8.
Q5
Convert 0.375 to a fraction.
A. 3/8
B. 37/100
C. 375/1000
D. 5/8
Answer: A
Rationale: 0.375 = 375/1000 = 3/8.
Q6
Which fraction is equivalent to 4/6?
, WGU D128 Mathematics for elementary Educators
A. 1/3
B. 2/3
C. 3/4
D. 4/5
Answer: B
Rationale: Divide numerator and denominator by 2.
Q7
A recipe requires 3/4 cup of sugar. If doubled, how much sugar is needed?
A. 1 cup
B. 1¼ cups
C. 1½ cups
D. 2 cups
Answer: C
Rationale: 3/4 × 2 = 6/4 = 1½.
Q8
What is 5/8 + 1/4?
A. 6/8
B. 7/8
C. 8/8
D. 9/8
Answer: B
Rationale: 1/4 = 2/8; 5/8 + 2/8 = 7/8.
Q9
A number line model is most effective for teaching:
, WGU D128 Mathematics for elementary Educators
A. Prime factorization
B. Fraction magnitude
C. Area formulas
D. Geometry proofs
Answer: B
Rationale: Number lines help students compare fraction sizes.
Q10
Which decimal is largest?
A. 0.45
B. 0.405
C. 0.54
D. 0.504
Answer: C
Rationale: Compare place values.
Q11
A polygon with eight sides is called:
A. Hexagon
B. Heptagon
C. Octagon
D. Nonagon
Answer: C
Q12
The sum of angles in a triangle equals:
A. 90°
B. 180°
