1. what was it 4 hr 30 min before 9:50 am?
2. Tennis instruction at camp Cherokee is for 45 minutes a day 4 days a week. how many hour a week is this?
3. A plane flies from phoenix to Memphis in 3 hours and 20 minutes. it left phoenix at 2:50 pm mountain time. At what time did it arrive in Memphis (central time)?

Which estimate is better for each?
1. Height of a flag pole: 2. Mass of a thumbtack:
12 m or 100 cm 1 g or 20 mg

3. Bottle of milk: 4. cool day:
100 mL or 2 L 70° c or 2° c

complete

1. 1,000 mL= L
2. 1,750 m= km
3. 5.2 g= mg
4. 6.1 L= mL
5. 1 mm= m
6. 4.6 m= m
7. 2 t= kg
8. 3 d= h