Show:
Rounding
Estimation by Adding
Estimation by Subtracting
Estimation by Multiplying
Distributive Property
100

26 to the nearest ten.

30

100

127+54

180

100

534-45

450

100

12x5

50

100

2x45

90

200

784 to the nearest ten

780

200

673+78

780

200

785-39

760

200

23x8

160

200

5x79

395

300

7,302 the the nearest ten 

7,300

300

659+734

1,400

300

945-303

600

300
785x7

5,600

300

6x694

4,164

400

67,520 to the nearest hundred

67,500

400

5,478+439

5400

400

5,907-385

5,600

400

5439x6

30,000

400

3x257

771

500

785,643 to the nearest ten thousand

790,000

500

675,980+3,654 (round the the thousands place on both)

680,000

500

789,053-4,563

795,000

500

7,624x8

64,000

500

4x1,923

7,692