Rounding
Round 628 to the nearest ten
630
Use rounding to estimate the sum of 23+99=____. Shows work
20+100 = 120
Use rounding to estimate the difference.
92-43=
90-40=50
Find the sum use break apart strategy.
545+139=_____
684
Estimate. Find the difference.
679-482=
700-500 = 200
Round 704 to the nearest hundred
700
Estimate. Then find the sum
356+442=____
Estimate: 800
Sum: 798
Use rounding to estimate the differences.
445-112=
400-100=300
Find the sum using place value strategy.
437+184=_______
621
Estimate. Then find the difference.
537-123=_______
400
414
Round 58 to the nearest hundred
100
Estimate. Then find the sum
164+230=____
Estimate: 400
Sum: 394
Use rounding to estimate differences.
394 - 147=
250
Estimate. Then find the sum.
39+243=
Estimate: 40+200=240
Sum: 282
Henry H. used 67+38=105 to check his subtraction. Which math problem could he be checking? Mark ALL that apply.
A. 67 - 38=____
B.105 - 67=____
C. 105 +38=____
D. 105 -38=_____
B and C
YongXiang planted 77 daisies, 48 roses, and 39 tulips. About how many more roses and tulips did she plant than daisies?
About 10 more
Jesus collected 139 cans for recycling on Monday, and 14 more on Tuesday. How many cans did he collect on Tuesday?
153 cans
During October, 3rd grade decide to have a reading contest and the result as follow.
Ms. Vy's class - 273 books
Mrs. Hong's class - 402 books
Mrs. Ward's class - 247 books
Select true or false (T/F) for each statement:
1. Ms. Hong's class read about 100 more books than Ms. Vy's class. T/F
2. The 3 classes read over 900 books altogether. T/F
3. Mrs. Ward's class read about 50 fewer books than Ms. Vy's class. (T/F)
4. Mrs. Hong's and Mrs. Ward's class read about 700 books. (T/F)
1. True
2. True
3. False
4. False
Younong was making paper flowers for friends. In January, she gave away 246 paper flowers to her family. In March, she gave away 349 paper flowers to her neighbors. How many more flowers did she give away in January than March?
103 paper flowers
Jose has 402 pieces in a building set. He uses 186 pieces to build a house. How many pieces does he have left? Show your work.
216 pieces;
402 - 186=216
James sold 237 cups of lemonade at his lemonade stand. What is 237 rounded to the nearest ten? Include the unit label.
240 cups
There are 294 boys and 332 girls in the Emerson school. How many students are in the school?
626 students
Lea sold 336 muffins at the bake sale. Noah sold 287 muffins. Noah estimates that he sold 50 fewer muffins than Lea. How did he estimate? Explain.
Noah rounded to the nearest ten.
He rounded 336 to 340 and 287 to 290.
Then he subtracted 340-290= 50
Younong was making paper flowers for friends. In January, she gave away 246 paper flowers to her family. In February, she gave away 418 paper flowers to her friends. In March, she gave away 349 paper flowers to her neighbors. How many paper flowers did she give away in January and February?
664 paper flowers.
Priscilla solved this problem. She says the difference is 214. Is she correct? If not, what is the correct answer?
352-148=
No.
201