Estimation and Rounding — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A stadium holds 4,562 people. About how many people does it hold, rounded to the nearest 1,000? (Grade 4)
A) 4,000
B) 5,000
C) 4,500
D) 6,000
The hundreds digit is 5, so 4,562 rounds up to 5,000.
2. A library has 8,247 books. About how many books, rounded to the nearest 100? (Grade 4)
A) 8,300
B) 8,000
C) 8,200
D) 8,250
The tens digit is 4, less than 5, so 8,247 rounds down to 8,200.
3. A school estimated 478 x 6 and got 3,000. The actual answer is 2,868. Is 3,000 a reasonable estimate? (Grade 4)
A) No, far too high
B) Yes, very reasonable
C) No, far too low
D) Cannot tell
Rounding 478 to 500 gives 500 x 6 = 3,000, which is close to the actual 2,868, so the estimate is reasonable.
4. A Grade 4 class counted 3,728 cans for recycling. About how many cans, rounded to the nearest 1,000?
A) 3,000
B) 4,000
C) 3,700
D) 3,800
Because 7 is 5 or more, 3,728 rounds up to 4,000.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Grade 4: 6,389 rounded to the nearest 1,000 is 6000.
Since 3 is less than 5, 6,389 rounds down to 6,000.
2. Grade 4 estimate: 612 x 4 using rounding is about 2400.
Rounded to 600, the estimate 600 x 4 = 2,400 is close to the actual 2,448.
3. A Grade 4 student estimates 3,178 + 4,915 to the nearest 1,000 as 8000.
Rounded, 3,000 + 5,000 = 8,000, near the actual 8,093.
4. Grade 4: 1,549 rounded to the nearest 100 is 1500.
Since 4 is less than 5, 1,549 rounds down to 1,500.
5. Grade 4 estimate: 295 x 3 using rounding is about 900.
Rounded to 300, the estimate 300 x 3 = 900 is near the actual 885.