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# Numbers & Operations in Base Ten Review

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## Numbers & Operations in Base Ten Review Answer Key

1.
$ul({:( ,150),(+,250):})$
• 400

2.
$ul({:( ,824),(+,106):})$
• 930
3.
$ul({:( ,741),(-,207):})$
• 534

4.
$ul({:( ,303),(-,236):})$
• 67
5.
$20 xx 6 =$
• 120

6.
$10 xx 9 =$
• 90
7.
Fill in each blank with the missing three-digit number that makes the equation true.

$300 + 200 = 100 +$ 400

165 $+ 235 = 150 + 250$

$680 +$ 220 $= 490 + 410$

$542 + 319 =$ 374 $+ 487$

$703 + 198 = 374 +$ 527

8.
Fill in each blank with the missing three-digit number that makes the equation true.

$900 - 200 = 800 -$ 100

395 $- 105 = 535 - 245$

$680 -$ 100 $= 810 - 230$

$528 - 364 =$ 600 $- 436$

$677 - 109 = 843 -$ 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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