| Place Value / Rounding | Addition | Subtraction | Estimation | Misc Word Problems |
| 10 | 10 | 10 | 10 | 10 |
| 20 | 20 | 20 | 20 | 20 |
| 30 | 30 | 30 | 30 | 30 |
| 40 | 40 | 40 | 40 | 40 |
| 50 | 50 | 50 | 50 | 50 |
| Final Question | ||||
What place is the 6 in in the number 462?
What place is the 6 in in the number 462?
Tens place
What is the place of the 2 in the number 9234?
What is the place of the 2 in the number 9234?
Hundreds place
Sarah rounded 78 to the nearest 10 and got 90. Is she right? Why or why not?
Sarah rounded 78 to the nearest 10 and got 90. Is she right? Why or why not?
She is wrong.
78 would round to 80 going to the nearest 10. You only go up to the immediate 10 above. 90 is too far away to work.
You underline the number in the TENS and look to the right. That tells you to round up.
Round 672 to both the nearest 10 and the nearest 100.
Round 672 to both the nearest 10 and the nearest 100.
Nearest 10 - 670
Nearest 100 - 700
Monica rounded 849 to the nearest hundred and got 900. Is she correct? Why or why not?
Monica rounded 849 to the nearest hundred and got 900. Is she correct? Why or why not?
She is not correct.
You would underline the HUNDREDS place and look to the right. The tens place is a 4 so it rounds DOWN. The correct answer would be 800.
673 + 189
673 + 189
862
712 + 648
712 + 648
1360
4357 + 853
4357 + 853
5210
There were 265 people at the afternoon show. There were 387 people at the evening show. How many people were at the two shows?
There were 265 people at the afternoon show. There were 387 people at the evening show. How many people were at the two shows?
265 + 387 = 652
Sue had 4362 ice cream cones. Her sister Jane gave her 6545 more, and her brother Jack added 43 to her pile. How many ice cream cones does she have?
Sue had 4362 ice cream cones. Her sister Jane gave her 6545 more, and her brother Jack added 43 to her pile. How many ice cream cones does she have?
4362 + 6545 + 43 = 10,950
873 - 142
873 - 142
731
673 - 586
673 - 586
87
807 - 439
807 - 439
368
There were 3422 students in the gym for the assembly. Then, 89 students left the gym. How many students stayed in the gym?
There were 3422 students in the gym for the assembly. Then, 89 students left the gym. How many students stayed in the gym?
3,333 students stayed
Rosi had 200 sheets of construction paper. She used 67 sheets making invitations to a party and the rest making decorations. How many sheets did she use to make decoration?
Rosi had 200 sheets of construction paper. She used 67 sheets making invitations to a party and the rest making decorations. How many sheets did she use to make decoration?
200 - 67 = 133 sheets
Sarah ate 17 cookies on Monday, and she ate 12 cookies on Tuesday. ABOUT how many cookies did Sarah eat over the two days.
Sarah ate 17 cookies on Monday, and she ate 12 cookies on Tuesday. ABOUT how many cookies did Sarah eat over the two days.
ABOUT - 20 + 10 = 30
EXACT - 17 + 12 = 29
Sam got 13 tickets to the movies. Karen got 17 tickets to the same movie. Finally, Alex got 25 tickets to it. ABOUT how many total tickets to the movie did they buy?
Sam got 13 tickets to the movies. Karen got 17 tickets to the same movie. Finally, Alex got 25 tickets to it. ABOUT how many total tickets to the movie did they buy?
10 + 20 + 30 = 60 tickets
Clement ate 59 pounds of dog food. Beni ate 199 pounds. ABOUT how much more did Beni eat than Clement?
Clement ate 59 pounds of dog food. Beni ate 199 pounds. ABOUT how much more did Beni eat than Clement?
200 - 60 = 140
Frank was buys sorting important papers when suddenly the wind blew them to the ground. He knew that he had 328 red papers, 32 green papers, and 109 orange papers. ABOUT how many papers were scattered on the floor?
Frank was buys sorting important papers when suddenly the wind blew them to the ground. He knew that he had 328 red papers, 32 green papers, and 109 orange papers. ABOUT how many papers were scattered on the floor?
ABOUT - 320 + 30 + 110 = 460 papers
Frank picked up about 450 pieces of paper from the ground suddenly he tripped over a pencil and 98 of the papers dropped. Sue came by and picked up 23 of the papers. ABOUT how many papers does Frank have?
Frank picked up about 450 pieces of paper from the ground suddenly he tripped over a pencil and 98 of the papers dropped. Sue came by and picked up 23 of the papers. ABOUT how many papers does Frank have?
ABOUT
450 - 100 = 350
350 + 20 = 370
Jill made a 434 cookies for her party. Sarah made 278 cookies for the party, too. How many cookies will they have at the party?
Jill made a 434 cookies for her party. Sarah made 278 cookies for the party, too. How many cookies will they have at the party?
434 + 278 = 712 cookies
Ms. Kaszycki bought 569 dog treats. Ms. Madlon stole 276 of them. How many dog treats does Ms. Kaszycki have now?
Ms. Kaszycki bought 569 dog treats. Ms. Madlon stole 276 of them. How many dog treats does Ms. Kaszycki have now?
569 - 276 = 293 treats
Estimate to BOTH the nearest 10 and nearest 100 to answer: 804 - 379
Then find the actual answer.
Which estimation would be a better choice? Why?
Estimate to BOTH the nearest 10 and nearest 100 to answer: 804 - 379
Then find the actual answer.
Which estimation would be a better choice? Why?
Nearest ten: 800 - 380 = 420
Nearest hundred: 800 - 400 = 400
Actual answer: 804 - 379 = 425
Sam and Ella were at Disney World. They REALLY wanted to ride the Harry Potter rollercoaster. After half an hour in line there were 327 people in front of them and 294 people behind them. ABOUT many total people were waiting in line?
(Then find the exact answer)
Sam and Ella were at Disney World. They REALLY wanted to ride the Harry Potter rollercoaster. After half an hour in line there were 327 people in front of them and 294 people behind them. ABOUT many total people were waiting in line?
(Then find the exact answer)
ABOUT -
330 + 290 + 0 = 620
327 + 294 + 2 = 623
- Sam had 342 candy bars to sell at his store. On Monday he sold 133 and on Tuesday he sold 34. ABOUT how many does he have left? First decide if it is most sensible to round to the nearest 10 or the nearest 100.
Why did you chose to round the way you did?
- Sam had 342 candy bars to sell at his store. On Monday he sold 133 and on Tuesday he sold 34. ABOUT how many does he have left? First decide if it is most sensible to round to the nearest 10 or the nearest 100.
Why did you chose to round the way you did?
Nearest 10
340 - 130 - 30 = 180 candy bars left
Nearest 100
300 - 100 - 0 = 200 candy bars left
Actual answer
342 - 133 - 34 = 175 candy bars left
MOST SENSIBLE? Nearest 10 - always gives a closer answer, at least 1 of the numbers would round to 0.
Ms. Kaszycki bought 874 pieces of chocolate. She ate 238. Ms. Worley ate 127. Ms. Madlon ate 172. Ms. Skerry came and ate the rest. ABOUT how many pieces of chocolate did Ms. Skerry eat?
Ms. Kaszycki bought 874 pieces of chocolate. She ate 238. Ms. Worley ate 127. Ms. Madlon ate 172. Ms. Skerry came and ate the rest. ABOUT how many pieces of chocolate did Ms. Skerry eat?
870 - 240 - 130 - 170 = 330
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