Rounding
Round 56 to the nearest 10
60
251 + 149 = ____________
400
True or False:
423 - 128 = 422 - 127
True
This month, fourth and fifth graders at Stratford Elementary had a contest to see who could read the most books by the end of the month. Fourth graders read 752 books and fifth graders had 625 books.
Who won the contest?
Fourth graders
This month the third and fourth graders at Waterville Elementary School had a contest to see who could collect the most stickers. By the end of the month, the fourth graders had collected 613 stickers and the fourth graders had collected 674. How many more stickers did the fourth graders collect than the fourth graders?
Write an equation to represent this problem. Choose a letter to represent the number you are trying to figure out.
674-613=s
Round 15 to the nearest 10
20
136 + 257 = __________
393
743 - 29 = __________ - 30
744
This month, fourth and fifth graders at Stratford Elementary had a contest to see who could read the most books by the end of the month. Fourth graders read 752 books and fifth graders had 625 books.
How many more books did the winners read than the losers? Show your work.
127 books
This month the third and fourth graders at Waterville Elementary School had a contest to see who could collect the most stickers. By the end of the month, the fourth graders had collected 613 stickers and the fourth graders had collected 674. How many more stickers did the fourth graders collect than the fourth graders?
Use rounding to estimate the answer to the problem. Show your thinking.
670-610=60
or
700-600=100
Round 150 to the nearest 100
200
Which 2 numbers have a sum closest to 600?
460 300 170 342
300 and 342
152-107
45
This month, fourth and fifth graders at Stratford Elementary had a contest to see who could read the most books by the end of the month. Fourth graders read 752 books and fifth graders had 625 books.
How many more books do the fifth graders need to read to win?
128 books
This month the third and fourth graders at Waterville Elementary School had a contest to see who could collect the most stickers. By the end of the month, the fourth graders had collected 613 stickers and the fourth graders had collected 674. How many more stickers did the fourth graders collect than the fourth graders?
Find the actual answer to the problem. Show your thinking.
674-613=61 stickers
Round 1,361 to the nearest 100
1,300
356 + 451 = ______ + 450
357
219-49
170
This month, fourth and fifth graders at Stratford Elementary had a contest to see who could read the most books by the end of the month. Fourth graders read 752 books and fifth graders had 625 books. How many more books did the winners read than the losers?
Write an equation to represent the problem. Use b to represent books.
752-625= b
Or
752 - b = 625
Or
625 + b = 752
There were 352 books in the third grade class library. Last week, 91 books were checked out, and 22 books were returned. How many books are in the third grade class library now?
Write an equation to represent the problem. Choose a letter to represent the number you're trying to figure out.
352-91+22=b
Round 957 to the nearest 100
1,000
Write an addition problem that has the same sum as 328 + 111. Show your thinking or explain your reasoning.
The sum must equal 439.
Write a subtraction problem that has the same difference as 126 – 107. Show your thinking or explain your reasoning.
The difference must equal 19.
Fourth graders had 428 students. Over winter break, 92 students moved away, but 28 moved in.
How many students are now in fourth grade? Show your work.
364 students
There were 352 books in the third grade class library. Last week, 91 books were checked out, and 22 books were returned. How many books are in the third grade class library now?
Use rounding to estimate the answer to the problem. Show your thinking.
350-90+20= 280
or
400-100+20= 320