Rounding to Nearest 10 and 100 — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. What is 847 rounded to the nearest hundred?
A) 800
B) 840
C) 850
D) 900
762 rounded to the nearest hundred is 800 because the tens digit (6) is 5 or greater, so we round up.
2. A farmer has 68 apples and picks 45 more. About how many apples are there when rounded to the nearest ten?
A) 100
B) 110
C) 120
D) 130
63 rounds to 60 and 48 rounds to 50, so 60 + 50 = 110.
3. Which of these numbers does NOT round to 300 when rounded to the nearest hundred?
A) 289
B) 312
C) 350
D) 251
251 rounds to 250 because the ones digit (1) is less than 5, so we round down to 250.
4. Rounding 455 to the nearest ten gives you what number?
A) 450
B) 460
C) 500
D) 400
456 rounded to the nearest ten is 460 because the ones digit (6) is 5 or greater, so we round up.
Part B: Fill in the Blank
Write the correct answer on each line.
1. 724 rounded to the nearest hundred is 700.
724 rounded to the nearest hundred is 700 because the tens digit (2) is less than 5, so we round down.
2. 63 + 88 is about 150 when each number is rounded to the nearest ten.
63 rounds to 60 and 88 rounds to 90, so 60 + 90 = 150.
3. 537 rounded to the nearest ten is 540.
537 rounded to the nearest ten is 540 because the ones digit (7) is 5 or greater, so we round up.
4. When rounding 950 to the nearest hundred, the answer is 1000.
950 rounded to the nearest hundred is 1000 because the tens digit (5) is 5 or greater, so we round up.
5. 91 - 47 is about 40 when each number is rounded to the nearest ten.
91 rounds to 90 and 47 rounds to 50, so 90 - 50 = 40.