CBEST Math: Estimation and Measurement 2 — Questions and Answers
Question 1: A recipe calls for 2¾ cups of flour. Which estimate is most reasonable when doubling the recipe?
- About 5 cups
- About 6 cups (Correct answer)
- About 7 cups
- About 8 cups
Correct answer: About 6 cups
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?
- 100 sq ft
- 110 sq ft
- 126 sq ft (Correct answer)
- 130 sq ft
Correct answer: 126 sq ft
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?
- Milligram
- Gram
- Kilogram (Correct answer)
- Metric ton
Correct answer: Kilogram
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?
- About 50 mph
- About 60 mph (Correct answer)
- About 70 mph
- About 80 mph
Correct answer: About 60 mph
287 ÷ 4.9 ≈ 300 ÷ 5 = 60 mph.
Question 5: How many millimeters are in 4.5 centimeters?
- 0.45 mm
- 4.5 mm
- 45 mm (Correct answer)
- 450 mm
Correct answer: 45 mm
1 cm = 10 mm, so 4.5 cm × 10 = 45 mm.
Question 6: A store sells juice in 64-fluid-ounce containers. Approximately how many liters is this? (1 liter ≈ 33.8 fl oz)
- About 1 liter
- About 2 liters (Correct answer)
- About 3 liters
- About 4 liters
Correct answer: About 2 liters
64 ÷ 33.8 ≈ 1.89, which is closest to 2 liters.
Question 7: A fence post casts a shadow of 3 feet when a nearby 6-foot person casts a shadow of 4 feet. How tall is the fence post?
- 3.5 feet
- 4 feet
- 4.5 feet (Correct answer)
- 5 feet
Correct answer: 4.5 feet
Using proportions: post/3 = 6/4, so post = 18/4 = 4.5 feet.
CBEST Math: Estimation and Measurement 2
A recipe calls for 2¾ cups of flour.
Which estimate is most reasonable when doubling the recipe?