Ch.1

Adding

100

78+34

112

200

678+453

1131

300

2357+9753

12110

400

32134+43251

75385

500

678123+123543

801666

Estimating

100

67 rounded to the nearest ten

70

200

185 rounded to the nearest hundred

200

300

9784 Rounded to the nearest thousand

10000

400

89346 Rounded to the nearest 10,000

90000

500

567341 Rounded to the nearest hundred thousand

600000 

Subtracting

100

69-54

15

200

963-333

630

300

8910-1972

693

400

60200-12800

47400

500

999999-450555

549444

Identify place values

100

52

5=10 2=1

200

947

9=100 4=10 7=1

300

6376

6=1000 3=100 7=10 6=1

400

43744

4=10000 3=1000 7=100 4=10 4=1

500

764839

7=100000 6=10000 4=1000 8=100 9=1

Identify the value

100

25

20+5

200

666

600+60+6

300

1569

1000+500+60+9

400

53670

50000+3000+600+70+0

500

906890

900000+00000+60000+800+90+0