Free Iowa Test of Basic Skills (ITBS) 8th Grade Questions and Answers

Question 1

Get the LCM of 224 and 280.

Accepted Answer

1120

Answer

280

Answer

504

Answer

2240

Question 2

A cube has a 725-cubic-centimeter volume. Which of the following comes closest to describing how long each cube edge is?

Accepted Answer

9 centimeters

Answer

8 centimeters

Answer

7 centimeters

Answer

10 centimeters

Question 3

Which of the ensuing figures makes a perfect square?

Accepted Answer

25

Answer

75

Answer

50

Answer

20

Question 4

8 is reduced by adding a number, n, and the product of 5. Which expression best encapsulates this assertion?

Accepted Answer

8  (n + 5)

Answer

8 + (n + 5)

Answer

(n + 5) + 8

Answer

(n + 5)  8

Question 5

What is considered to be an error or alteration in an organism's DNA?

Accepted Answer

Mutation

Answer

Environmental Selection

Answer

Natural Selection

Answer

Evolution

Question 6

What is the process that enables organisms to survive and pass on their genetic features when they are most compatible with their environment.

Accepted Answer

Natural Selection

Answer

Mutation

Answer

Environmental Selection

Answer

Evolution

Question 7

What among the following leads to extinction?

Accepted Answer

All options are correct

Answer

Agriculture

Answer

Deforestation

Answer

Habitat Fragmentation

Question 8

A species is considered to have _________ when it becomes more adapted to its surroundings.

Accepted Answer

adapted

Answer

grown

Answer

mutated

Answer

evaporated

Question 9

Which word has the incorrect spelling?

Accepted Answer

disciplinery

Answer

stationery

Answer

exemplary

Answer

machinery

Question 10

Which line has a mistake in the spelling?

Accepted Answer

patios, radios, heros

Answer

altos, pianos, solos

Answer

rodeos, videos, sopranos

Answer

potatoes, tomatoes, concertos