Topic Two Review

+/-

100

What is the sum of 28,394 + 43,287

71,681

200

If Marvin had 789 ravens but needed 19,243 ravens for his show. How many more does he need?

18,454 ravens 

300

16,382 + 769,541

785,923

400

Daniel had 72,944 rings with gems, but he decided to give his brother 8,301 of the rings, 22 rings to his sister and 9,122 to his mother. He says that he now has 90,389 rings. Is he correct? Explain why or why not?    

No, because he added the rings, he gave away instead of subtracting them. 

500

873,912 - 87,854 = 86,058 is incorrect. Figure out what Ms. G did wrong. 

Ms. G forgot to finish subtracting the number. The correct answer is 786,058. Oops...

Estimation

100

What is the rule about estimating?

4 and below you stay in place, 5 and above you go up. 

200

Dottie counted out 702 books in Dawn's pile. Dawn wanted to estimate how many books she received to the nearest hundreds place. What number do you think Dawn will estimate to?

700

300

Round 9,872 to the nearest thousands place. 

10,000

400

Goldie rounded the number 15,976 to the nearest ten thousand place. She rounded the number to 15,000. Is she correct, why or why not?

No, because the neighbor number is 5 and you round up. 5 and above you go up. 

500

Solve 789,324 + 625,432 by rounding both numbers to the nearest hundred thousand place. 

800,000 + 600,000 = 1,200,000

Inverse Operations

100

What is the inverse operation of Subtraction

Addition

200

What is the inverse operation of Division?

Multiplication

300

198 + 234 = 432 is correct, but how could I make sure that I got the right answer. 

432-234 = 198

or 

432-198 = 234

400

Mrs. Fogg solved a math problem on the board but needs you to check her math. She did the following 834-123= 711. Show how you can check her math.

711+123=834

500

Ms. Fleury solved 834,999+763,410 = 1,598,409. She checked her math using inverse operation and got 763,410 - 1,598,409 = 834,999. What did Ms. Fleury do wrong?

You can't subtract 1,598,409 from 763,410. 

Subtracting with zeros

100

Solve 802 - 632 and show your work. 

170

200

How many times do you need to carry a number in this problem. 743+888. 

2 times. 

300

6,002-3,409=?

2,593

400

803,001-801,667=?

1,334

500

98,401-76,507=

21,894

Miscellaneous

100

3X7 = ?

21

200

22 divided by 2 is what number?

11

300

I multiplied 4X5 and got 20. What is another way you could write 4X5 but using addition. 

4+4+4+4+4 = 20

400

What place value comes after one hundred thousand? 

1 million

500

Explain your thinking and show your work. How would I go about solving this problem? 

Mrs. Fogg and Ms. G are going to a disco party! They need to make 8 bowls of sundaes. To create this sundae, they use 4 scoops of chocolate ice cream, 4 scoops of vanilla ice cream, 5 scoops of bananas, 3 scoops of caramel syrup. How many scoops does each bowl have?  

2 scoops per bowl. (Make sure they showed their work)