CBEST Math: Estimation and Measurement 4 — Questions and Answers
Question 1: A map has a scale of 1 inch = 25 miles. Two cities are 3.6 inches apart on the map. What is the actual distance?
- 72 miles
- 80 miles
- 90 miles (Correct answer)
- 95 miles
Correct answer: 90 miles
3.6 inches × 25 miles/inch = 90 miles.
Question 2: A tank is being filled at 2.4 gallons per minute. Approximately how long will it take to fill a 100-gallon tank?
- About 30 minutes
- About 40 minutes
- About 42 minutes (Correct answer)
- About 50 minutes
Correct answer: About 42 minutes
100 ÷ 2.4 ≈ 41.7 minutes, which is approximately 42 minutes.
Question 3: How many square feet are in 3 square yards?
- 9 sq ft
- 18 sq ft
- 27 sq ft (Correct answer)
- 36 sq ft
Correct answer: 27 sq ft
1 square yard = 9 square feet, so 3 square yards = 27 square feet.
Question 4: A box weighs 4.72 kilograms. Which is the best estimate rounded to the nearest kilogram?
- 4 kg
- 5 kg (Correct answer)
- 4.7 kg
- 4.8 kg
Correct answer: 5 kg
4.72 rounded to the nearest whole kilogram is 5 kg, since the tenths digit (7) is ≥ 5.
Question 5: A student estimates that 12% of 498 is about 60. Is this estimate reasonable?
- No, it should be about 6
- No, it should be about 40
- Yes, it is reasonable (Correct answer)
- No, it should be about 100
Correct answer: Yes, it is reasonable
10% of 500 = 50, and 12% is slightly more, so about 60 is a reasonable estimate.
Question 6: Which measurement is equivalent to 2.5 kilometers?
- 250 meters
- 2,500 meters (Correct answer)
- 25,000 meters
- 250,000 meters
Correct answer: 2,500 meters
1 kilometer = 1,000 meters, so 2.5 km × 1,000 = 2,500 meters.
Question 7: If a car gets 32 miles per gallon and gas costs $3.89 per gallon, approximately how much does it cost to drive 160 miles?
- About $15
- About $18
- About $19 (Correct answer)
- About $20
Correct answer: About $19
160 ÷ 32 = 5 gallons × $3.89 ≈ $19.45, approximately $19.
CBEST Math: Estimation and Measurement 4
A map has a scale of 1 inch = 25 miles.
Two cities are 3.6 inches apart on the map.
What is the actual distance?