STAAR Grade 5: Math 2 — Questions and Answers
Question 1: What is 15% of 80?
- 10
- 12 (Correct answer)
- 15
- 20
Correct answer: 12
15% of 80 = 0.15 × 80 = 12.
Question 2: A train travels 240 miles in 4 hours. What is its average speed in miles per hour?
- 40 mph
- 50 mph
- 60 mph (Correct answer)
- 80 mph
Correct answer: 60 mph
Speed = distance ÷ time = 240 ÷ 4 = 60 mph.
Question 3: What is the greatest common factor (GCF) of 36 and 48?
- 6
- 9
- 12 (Correct answer)
- 18
Correct answer: 12
The factors of 36 include 1, 2, 3, 4, 6, 9, 12, 18, 36; factors of 48 include 1, 2, 3, 4, 6, 8, 12, 16, 24, 48; the greatest common factor is 12.
Question 4: Which expression shows the commutative property of addition?
- 3 + (4 + 5) = (3 + 4) + 5
- 5 + 0 = 5
- 6 + 7 = 7 + 6 (Correct answer)
- 2 × (3 + 4) = 2 × 3 + 2 × 4
Correct answer: 6 + 7 = 7 + 6
The commutative property states that changing the order of addends does not change the sum: 6 + 7 = 7 + 6.
Question 5: A box holds 6 rows of cans with 8 cans in each row. How many cans are in the box?
- 14
- 28
- 42
- 48 (Correct answer)
Correct answer: 48
Total cans = 6 rows × 8 cans per row = 48 cans.
Question 6: Which decimal is equivalent to 7/10?
- 0.07
- 0.7 (Correct answer)
- 7.0
- 0.007
Correct answer: 0.7
7/10 means 7 tenths, which is written as 0.7 in decimal form.
Question 7: If the pattern is 3, 6, 12, 24, ___, what is the next number?
- 36
- 42
- 48 (Correct answer)
- 72
Correct answer: 48
Each number in the pattern is doubled: 24 × 2 = 48.
