STAAR Grade 5: Math 2

Question 1

What is 15% of 80?

Accepted Answer

12

Answer

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?

Accepted Answer

60 mph

Answer

Speed = distance ÷ time = 240 ÷ 4 = 60 mph.

Question 3

What is the greatest common factor (GCF) of 36 and 48?

Accepted Answer

12

Answer

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?

Accepted Answer

6 + 7 = 7 + 6

Answer

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?

Accepted Answer

48

Answer

Total cans = 6 rows × 8 cans per row = 48 cans.

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