CAAT Numerical Estimation and Approximation 1 — Questions and Answers
Question 1: Which is the best estimate for 48 × 19?
- 500
- 800
- 1,000 (Correct answer)
- 1,200
Correct answer: 1,000
Rounding 48 to 50 and 19 to 20 gives 50 × 20 = 1,000.
Question 2: What is the best estimate for 897 ÷ 29?
- 10
- 20
- 30 (Correct answer)
- 40
Correct answer: 30
Rounding 897 to 900 and 29 to 30 gives 900 ÷ 30 = 30.
Question 3: Approximately what is 18% of 550?
- 50
- 75
- 100 (Correct answer)
- 130
Correct answer: 100
18% is close to 20%, and 20% of 550 = 110, so the best estimate is about 100.
Question 4: Approximately how much is 2,489 + 3,512?
- 4,000
- 5,000
- 6,000 (Correct answer)
- 7,000
Correct answer: 6,000
Rounding to 2,500 + 3,500 = 6,000.
Question 5: Which whole number is closest to the square root of 50?
- 5
- 6
- 7 (Correct answer)
- 8
Correct answer: 7
Since 7² = 49 and 8² = 64, the square root of 50 is closest to 7.
Question 6: A store sold 312 items at roughly $9.95 each. What is the best estimate of total sales?
- $300
- $3,000 (Correct answer)
- $3,100
- $4,000
Correct answer: $3,000
Rounding 312 to 300 and $9.95 to $10 gives 300 × $10 = $3,000.
CAAT Numerical Estimation and Approximation 1
Which is the best estimate for 48 × 19?