ITBS Math Concepts and Estimation

Question 1

Which of the following is the best estimate for 48 × 21?

Accepted Answer

1,000

Answer

Rounding 48 to 50 and 21 to 20 gives 50 × 20 = 1,000, which is the closest estimate.

Question 2

What is the value of the digit 7 in the number 3,742?

Accepted Answer

700

Answer

The digit 7 is in the hundreds place, so its value is 700.

Question 3

A rectangle has a length of 12 cm and a width of 5 cm. What is its area?

Accepted Answer

60 cm²

Answer

Area of a rectangle = length × width = 12 × 5 = 60 cm².

Question 4

Which number is between 3/4 and 1 on a number line?

Accepted Answer

7/8

Answer

7/8 = 0.875, which falls between 3/4 (0.75) and 1 (1.0).

Question 5

If a bag of apples weighs about 3.7 pounds, which is the best estimate of the total weight of 6 bags?

Accepted Answer

22 pounds

Answer

Rounding 3.7 to 4 gives 4 × 6 = 24, but the actual answer 3.7 × 6 = 22.2 is closest to 22 pounds.

ITBS - Iowa Test of Basic Skills Exam Practice Test