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100

5-1=

4

100

 20-10=

10

100
700-400=

300

100

6000-2000=

4000

100

40hr.-20hr.=

20hr.

200

9-6=

3

200

53-12=

41

200

750-250=

500

200

8500-3500=

500

200

54hr.-13hr.=

41hr.

300

9-1=

8

300

89-43=

46

300

876-543=

333

300

9555-5550=

4005

300

2hr.40min-1hr.10min=

1hr.30min

400

7-3=

4

400

62-39=

23

400

785-392=

393

400

9856-3678=

6178

400

12hr.50min.-6hr.20min.=

6hr.30min.

500

8-3=

5

500

84-37=

47

500

978-489=

489

500

9124-3897=

5227

500

24hr.-40min.-15hr.-15min.

9hr.25min.