CBEST Math: Estimation and Measurement 2

Question 1

A recipe calls for 2¾ cups of flour. Which estimate is most reasonable when doubling the recipe?

Accepted Answer

About 6 cups

Answer

2¾ × 2 = 5½ cups, which rounds to about 6 cups.

Question 2

A rectangular room measures 13.8 feet by 9.2 feet. Which is the best estimate of its area?

Accepted Answer

126 sq ft

Answer

13.8 × 9.2 ≈ 14 × 9 = 126 sq ft is the closest estimate.

Question 3

Which metric unit is most appropriate for measuring the mass of a textbook?

Accepted Answer

Kilogram

Answer

A textbook typically weighs around 0.5–2 kilograms, making kilograms the appropriate unit.

Question 4

A car travels 287 miles in 4.9 hours. Which best estimates its average speed?

Accepted Answer

About 60 mph

Answer

287 ÷ 4.9 ≈ 300 ÷ 5 = 60 mph.

Question 5

How many millimeters are in 4.5 centimeters?

Accepted Answer

45 mm

Answer

1 cm = 10 mm, so 4.5 cm × 10 = 45 mm.

CBEST - California Basic Educational Skills Test Practice Test