Rounding to Nearest 10 and 100 — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
340 rounded to the nearest hundred is 400.
Corrected: 340 rounded to the nearest hundred is 300 because 4 is less than 5 so we round down.
The corrected sentence is: "340 rounded to the nearest hundred is 300 because 4 is less than 5 so we round down.". The original sentence "340 rounded to the nearest hundred is 400." contained an error that needed to be fixed.
2. Fix the sentence:
872 rounded to the nearest hundred is 800.
Corrected: 872 rounded to the nearest hundred is 900 because 7 is 5 or greater so we round up.
The corrected sentence is: "872 rounded to the nearest hundred is 900 because 7 is 5 or greater so we round up.". The original sentence "872 rounded to the nearest hundred is 800." contained an error that needed to be fixed.
3. Fix the sentence:
550 rounded to the nearest hundred is 500.
Corrected: 550 rounded to the nearest hundred is 600 because when the tens digit is exactly 5 we round up.
The corrected sentence is: "550 rounded to the nearest hundred is 600 because when the tens digit is exactly 5 we round up.". The original sentence "550 rounded to the nearest hundred is 500." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 230 rounded to the nearest hundred is 200.
230 rounded to the nearest hundred is 200 because the tens digit (3) is less than 5, so we round down.
2. 678 rounded to the nearest hundred is 700.
678 rounded to the nearest hundred is 700 because the tens digit (7) is 5 or greater, so we round up.
3. 450 rounded to the nearest hundred is 500.
450 rounded to the nearest hundred is 500 because the tens digit (5) is 5 or greater, so we round up.
4. 149 rounded to the nearest hundred is 100.
149 rounded to the nearest hundred is 100 because the tens digit (4) is less than 5, so we round down.
Part C: True or False?
Read each statement. Circle True or False.
1. When rounding to the nearest hundred, you look at the tens digit.
True False
The statement is true based on rounding rules.
2. 750 rounded to the nearest hundred is 700.
True False
The statement is false; check the rounding rule carefully.
3. 310 rounded to the nearest hundred is 300.
True False
The statement is true based on rounding rules.