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Numbers & Operations in Base Ten Review

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Numbers & Operations in Base Ten Review Answer Key

1. 
[math]ul({:( ,150),(+,250):})[/math]
  • 400
 
2. 
[math]ul({:( ,824),(+,106):})[/math]
  • 930
3. 
[math]ul({:( ,741),(-,207):})[/math]
  • 534
 
4. 
[math]ul({:( ,303),(-,236):})[/math]
  • 67
5. 
[math]20 xx 6 = [/math]
  • 120
 
6. 
[math]10 xx 9 = [/math]
  • 90
7. 
Fill in each blank with the missing three-digit number that makes the equation true.

[math]300 + 200 = 100 +[/math] 400


165 [math]+ 235 = 150 + 250[/math]


[math]680 +[/math] 220 [math]= 490 + 410[/math]


[math]542 + 319 =[/math] 374 [math] + 487[/math]


[math]703 + 198 = 374 +[/math] 527
 
8. 
Fill in each blank with the missing three-digit number that makes the equation true.

[math]900 - 200 = 800 -[/math] 100


395 [math]- 105 = 535 - 245[/math]


[math]680 -[/math] 100 [math]= 810 - 230[/math]


[math]528 - 364 =[/math] 600 [math] - 436[/math]


[math]677 - 109 = 843 - [/math] 275
9. 
Two hundred sixty-two students attend Westerbrook Elementary School. Round the number of students who go to Westerbrook to the nearest hundred.
  • 300
 
10. 
Tara has nineteen magazines. Round the number of magazines Tara has to the closest ten.
  • 20

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