Show:
Rounding and Estimation
Real World
Addition
Subtraction
100
Round 451 to the nearest ten and hundred.
450 and 500
100
Bob has 12,745 legos. George has 1,543 fewer legos than Bob. How many legos does George have?
George has 11,202 legos.
100
6,305 + 2,512
8,817
100
8,754 - 531
8,223
200
Round 1,345 to the nearest ten and hundred.
1,350 and 1,300
200
5,476 people ride Bus D in March. 1,486 fewer people ride Bus E in the same month. a. How many people ride Bus E in March B. How many people ride both buses in March?
a. 3,990 people ride Bus E in March. b. 9,466 people ride both buses in March.
200
3,100 + 2,800
5,900
200
8,615 - 2,704
5,911
300

Joe sold 145 cups of lemonade. Jim sold 218 cups of lemonade. About how many cups did the sell in all? Round each number to the nearest 10 and then add.

They sold about 370 in all.

300
A supermarket has 1,213 apples. 368 are green apples. a. How many of the apples are red? b. How many more red apples than green apples does the supermarket have?
a. 845 apples are red. b. There are 477 more red apples than green apples.
300
12,406 + 3,855
16,261
300
14,000 - 8,296
5,704
400

Bookshelf one has 549 books. Bookshelf two has 863 books. Bookshelf three has 398 books. About how many books are there in all? Round each number to the nearest 100 and then add.

There are about 1,800 books in all.

400
2,500 people visit the Children's Museum on Monday. On Tuesday, there were 532 more people at the museum than on Monday. What is the total number of visitors for both days?
There were 5,532 visitors total for both days.
400

______ + 2,058 = 6,323

4, 265

400

______ - 684 = 1,877

2,561

500

Joe has 1,678 baseball cards and Tom has 1,425. About how many cards do they have in altogether? Round each number to the nearest hundred and then add.

They have about 3,100 cards.

500
Michael has 754 songs in his audio device. He has 98 more songs than Peter. How many songs do they have in all?
They have 1,410 songs in all.
500

4, 672 + ______ = 8,251

3,579

500

5,010 - ______ = 1,325

3,685