Rounding
Round this number to the nearest 10.
252
250
Write this number in expanded and word form.
573
500 + 70 + 3= 573
five hundred seventy three
Find the sum of these two numbers.
405 +112
400 + 100 = 500
0 + 10 = 10
5 + 2 = 7
517
Solve the subtraction problem below.
155-134
100-100=0
50-30=20
5-4= 1
21
This month third and fourth graders at Heim Elementary School had a contest to see who could read the most books. By the end of the month, the third graders read 546 pages and fourth graders read 342 pages. Who read more pages? How many more pages did they read?
The third graders read more pages.
546 - 342 = 204
The third graders read 204 more pages than the fourth graders.
Round this number to the nearest hundred.
675
700
Is this statement true or false? Show your work.
449 + 113 = 450 + 114
False, if you add 1 to one side you must subtract 1 from the other side.
449 + 113 = 450 +112
Find the sum of these two numbers.
877 + 15
800 + 0 = 800
70 + 10 = 80
7 + 5 = 12
892
72-18
72-18
12 - 8 = 4
60 - 10 = 50
54
Shay is organizing a charity event. She has collected 248 dollars in the morning and 357 dollars in the afternoon. How much money has Shay collected in total?
Show your work! Use a number line, hundreds, tens, ones or standard algorithm.
248 + 357 = 605
200 + 300 = 500
20 + 50 = 90
8 + 7 = 15
Shay has collected $605 in total.
Round these numbers to the nearest hundred.
368 720 1,652 2,975
400 700 1,700 3,000
Determine if this statement is true or false. Show your work.
224-208 = 222-210
False, when subtracting you must do the same thing to both sides. Constant difference!
224 +2 = 226
208 + 2 = 210
224-208 = 226 - 210
Find the sum of these two numbers.
488 + 636
400 + 600 = 1,000
80 + 30 = 110
8 +6 = 14
1,124
Solve the subtraction problem below.
534 - 257
14 - 7 = 7
120 - 50 = 70
400 - 200 = 200
277
A toy store sold 462 action figures in January and 389 action figures in February. How many action figures did the store sell in both months?
Show your work! Use a number line, hundreds, tens, ones or standard algorithm.
462 + 389 =
400 + 300 = 700
60 + 80 = 140
2 + 9 = 11
851
The toy store sold 851 action figures in January and February.
Which two numbers have a sum closest to 700. Show your work.
356 212 378 476
I rounded all the numbers to the nearest hundred.
400 200 400 500
212 and 476 have the sum closest to 700.
Fill in the blank to complete each statement.
763 + 429 = ____ + 430
763 - 1 = 762
429 + 1 = 430
763 + 429 = 762 +430
Find the sum of these two numbers in two different ways. 393 + 888
Hundreds, tens, ones:
300 + 800= 1,100
90 + 80 = 170
3 + 8 = 11
1,281
You could also use standard algorithm or a number line!
Solve the following subtraction problem using two strategies.
732-253
12- 3 = 9
120 - 50 = 70
600 - 200 = 400
479
Lilly had 572 stickers. She used 198 stickers to decorate her notebook. How many stickers does Lily have remaining?
Show your work! Use a number line, hundreds, tens, ones or standard algorithm.
572 - 198 = 374
Lilly has 374 stickers left.
What two numbers have a sum closest to 1,000? How do you know?
555 420 270 518
555 and 420. I know this because I rounded all four numbers to the nearest hundred. 600, 400, 300, 500. I know that 600 + 400 = 1,000 so 555 + 420 is about 1,000.
Fill in the blank to make the statement true.
483 -219 = ___ - 220
483 + 1 = 484
219 + 1 = 220
483 - 219 = 484 - 220
Find the sum of these two numbers using two different strategies.
2,754 + 952
2,000 + 0 = 2,000
700 + 900 = 1,600
50 + 50 = 100
4 + 2 = 6
3,706
You could also use the standard algorithm or a number line!
Solve the following subtraction problem using two strategies.
605 - 376
Use a number line or the standard algorithm to show regrouping!
605 - 376 =
15 - 6 = 9
90 - 70 = 20
500 - 300 = 200
229
Sadiq had 734 marbles in his collection. He gave 376 marbles to his friend. How many marbles does Sadiq have left?
Show your work! Use a number line, hundreds, tens, ones or standard algorithm.
734 - 376 = 358
Sadiq has 358 marbles left.