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:
47 rounded to the nearest ten is 40.
Corrected: 47 rounded to the nearest ten is 50 because 7 is 5 or greater so we round up.
The corrected sentence is: "47 rounded to the nearest ten is 50 because 7 is 5 or greater so we round up.". The original sentence "47 rounded to the nearest ten is 40." contained an error that needed to be fixed.
2. Fix the sentence:
82 rounded to the nearest ten is 90.
Corrected: 82 rounded to the nearest ten is 80 because 2 is less than 5 so we round down.
The corrected sentence is: "82 rounded to the nearest ten is 80 because 2 is less than 5 so we round down.". The original sentence "82 rounded to the nearest ten is 90." contained an error that needed to be fixed.
3. Fix the sentence:
35 rounded to the nearest ten is 30.
Corrected: 35 rounded to the nearest ten is 40 because when the digit is exactly 5 we round up.
The corrected sentence is: "35 rounded to the nearest ten is 40 because when the digit is exactly 5 we round up.". The original sentence "35 rounded to the nearest ten is 30." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 63 rounded to the nearest ten is 60.
63 rounded to the nearest ten is 60 because the ones digit (3) is less than 5, so we round down.
2. 78 rounded to the nearest ten is 80.
78 rounded to the nearest ten is 80 because the ones digit (8) is 5 or greater, so we round up.
3. 24 rounded to the nearest ten is 20.
24 rounded to the nearest ten is 20 because the ones digit (4) is less than 5, so we round down.
4. 95 rounded to the nearest ten is 100.
95 rounded to the nearest ten is 100 because the ones digit (5) is 5 or greater, so we round up.
Part C: True or False?
Read each statement. Circle True or False.
1. When rounding to the nearest ten, you look at the ones digit.
True False
The statement is true based on rounding rules.
2. 54 rounded to the nearest ten is 60.
True False
The statement is false; check the rounding rule carefully.
3. If the ones digit is 5 or more, you round up to the next ten.
True False
The statement is true based on rounding rules.