Round & Estimate
Round 6,482 to the nearest hundred.
6,500
Find the sum:
5,728 + 3,416
9,144
Find:
6,950 − 2,847
4,103
Which symbol makes the statement true?
7,425 − 2,318 ___ 5,000
A. <
B. >
C. =
7,425 − 2,318 > 5,000
Round each number to the nearest thousand. Then find the estimated sum.
4,672 + 7,381
12,000
Find the missing number:
3,875 + _____ = 8,642
4,767
Find:
9,048 − 5,639
3,409
Find the missing number:
6,250 − ______ = 3,875
2,375
A school collected 3,764 cans in October and 5,289 cans in November.
Estimate the total by rounding each number to the nearest thousand.
Find the exact total.
Is the exact answer close to your estimate? Explain.
Estimate: 4,000 + 5,000 = 9,000
Exact: 3,764 + 5,289 = 9,053
C. Yes. 9,053 is close to 9,000.
Three classes collected cans for a food drive.
How many cans did they collect altogether?
Show an equation and your work.
2,786 + 3,459 + 1,875 = 8,120 cans
7,000 - 3,452
3,548
A student says:
2,450 + 3,175 + 550 = 5,175
Is the student correct?
If not, find the correct answer and explain the mistake.
No the student in not correct. The error is in the thousands place. The student added wrong, instead of a 5 it should be a 6.
A stadium had 8,736 people at one game and 4,582 people at another game.
1. Estimate the total attendance by rounding each number to the nearest thousand.
2. Find the exact total and check your work!
3. How much greater is the exact total than your estimate?
Estimate: 9,000 + 5,000 = 14,000
Exact: 8,736 + 4,582 = 13,318
Difference: 1,318 less than the estimate.
A student solved:
3,687 + 4,958 = 7,535
The student says, “I added all the digits correctly, so my answer must be correct.”
A. Find the correct sum.
B. Identify where the student's answer went wrong.
The correct sum is 8,645 the error was when they were adding in the hundreds place. 6 + 9 is 16 not 15. They also forgot to carry the one to the thousands place.
A store had 30,000 pencils in its warehouse. It shipped 18,675 pencils to different schools. How many pencils are left? Write your answer in a sentence. You must check your work!
There are 11,325 pencils left.
Look at this equation:
3,875 + 2,649 = 6,514
Is the equation true or false?
What is thee correct sum. Explain how you know without simply saying, “I added it again.”
This equation is false. The correct answer is 6,524. The error is in the tens place. The student forgot to add the carried over number.
The school district printed 12,684 flyers for an event. They printed 7,935 more flyers the following week.
1. Estimate the total number of flyers by rounding each number to the nearest thousand.
2. Find the exact total.
3. A student says, “The exact answer should be greater than 21,000 because the estimate is 21,000.” Is the student correct? Explain your thinking.
1. 13,000 + 8,000 = 21,000
2.12,684 + 7,935 = 20,619
3. No. The estimate is 21,000, but estimates can be slightly greater or less than the exact answer depending on how it rounds.
A school is ordering supplies for four classrooms.
How many pencils are needed altogether? Write a sentence explaining your answer.
10,803 pencils are needed all together.
A city library had 50,000 books in its collection. During the summer, 27,846 books were moved to another building.
Later, the library received 3,975 new books.
1. How many books were left in the original building after the move?
2. How many books were there after the new books arrived?
There were 22,154 books left. After the new books arrived there were 26,129 books in the library.
A school is comparing the number of books read by two grades.
Grade 4: 4,685 books
Grade 5: 3,798 books
Later, Grade 4 read 1,475 additional books, while Grade 5 read 1,825 additional books.
How many books did each grade read altogether?
Which grade read more books in total? Your answers must be written in complete sentences!
In total they read 11,783 books all together. 4th Grade read 6,160 books and 5th grade read 5,623 books.
The school is collecting cans for a food drive.
On Monday, students collected 3,875 cans. On Tuesday, they collected 2,946 cans. On Wednesday, some cans were added to the collection.At the end of Wednesday, the school had 9,250 cans altogether.
How many cans were collected on Wednesday? Show an equation that represents the entire problem. You must check your work !
There was a total of 2,429 cans collected on Wednesday.