adding
subtracting
estimating
what's missing
Potpourri
100

58 + 7,000 =

7,058

100

599 - 147

452

100

685 - 231 is about 

500

100

782 + _____ = 1,000

218

100

Round 12,654 to the nearest hundred

12,700

200

187 + 408 =

       

 

595

200

2,000 - 634 =

1,366

200

9,765 + 5,231 is about 

15,000

200

638 - ____ = 121

517

200

564, 569, 574, ____

579

300

1,053 + 9,437

10,490

300

4007 - 1526

2481

300

601 -444 is about 

200

300

____ + 3,876 = 6,083

2,207

300

HOw would you use adjusting to solve 500 – 294 . Show the problem.

499 - 293

400

25,064 + 25,174

50,238

400

7,003 - 2,524 =

4,479

400

2,009 - 427 is about 

1,600

400

____ + 473 + 1,271 = 3,000

1,256

400

The sum of the first 5 even counting numbers.

30

2 + 4 + 6 + 8 + 10

500

237 + 2,943 + 55

3,235

500

20,000 - 7,642

12,358

500

4,752 + 6,987 is about 12,000. Is the actual answer greater or less than 12,000?

It is less, you rounded both numbers up.

500

34,764 + ____ = 50,000

15,236

500

 The sum of the first 5 counting numbers that are odd

25

1 + 3 + 5 + 7 + 9

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