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McGraw-Hill Math Grade 7 Answer Key Lesson 18.7 Time
Exercises
CALCULATE
Question 1.
36 hours = __________ seconds
Answer:
36 hours is equal to 1,29,600 seconds
Explanation:
Conversion:
1 hour = 3,600 seconds.
36 hours = ?? seconds.
=> 1 × ?? = 3,600 × 36
=> ?? = 1,29,600 seconds.
Question 2.
25 days = __________ hours
Answer:
25 days is equal to 600 hours.
Explanation:
Conversion:
1 day = 24 hours.
25 days = ?? hours
=> 1 × ?? = 24 × 25
=> ?? = 600 hours.
Question 3.
35 days = ___________ minutes
Answer:
35 days is equal to 50,400 minutes.
Explanation:
Conversion:
1 day = 1,440 minutes.
35 days = ?? minutes.
=> 1 × ?? = 1,440 × 35
=> ?? = 50,400 minutes.
Question 4.
96 hours = ___________ days
Answer:
96 hours is equal to 4 days.
Explanation:
Conversion:
1 day = 24 hours.
?? days = 96 hours
=> 1 × 96 = 24 × ??
=> 96 ÷ 24 = ??
=> 4 days = ??
Question 5.
32 days = ___________ minutes
Answer:
32 days is equal to 46,080 minutes.
Explanation:
Conversion:
1 day = 1,440 minutes.
32 days = ?? minutes.
=> 1 × ?? = 1,440 × 32
=> ?? = 46,080 minutes.
Question 6.
125 minutes = ___________ hours
Answer:
125 minutes is equal to 2.08 hours.
Explanation:
Conversion:
1 hour = 60 minutes.
?? hours = 125 minutes.
=> 1 × 125 = 60 × ??
=> 125 ÷ 60 = ??
=> 2.08 hours = ??
Question 7.
91 days = ___________ weeks
Answer:
91 days is equal to 13 weeks.
Explanation:
Conversion:
1 week = 7 days.
?? weeks = 91 days.
=> 1 × 91 = 7 × ??
=> 91 ÷ 7 = ??
=> 13 weeks = ??
Question 8.
300 years = ___________ decades
Answer:
300 years is equal to 30 decades.
Explanation:
Conversion:
1 decade = 10 years.
?? decades = 300 years
=> 1 × 300 = 10 × ??
=> 300 ÷ 10 = ??
=> 30 decades = ??
Question 9.
2,500 years = ___________ centuries
Answer:
2,500 years is equal to 25 centuries.
Explanation:
Conversion:
1 century = 100 years.
?? centuries = 2,500 years
=> 1 × 2,500 = 100 × ??
=> 2,500 ÷ 100 = ??
=> 25 centuries = ??
Question 10.
6,000 seconds = __________ weeks
Answer:
6,000 seconds is equal to 0.009 weeks.
Explanation:
Conversion:
1 week = 6,04,800 seconds.
?? weeks = 6,000 seconds
=> 1 × 6,000 = 6,04,800 ÷ ??
=> 6,000 ÷ 6,04,800 = ??
=> 0.009 weeks = ??
Question 11.
If you get paid $700 and you worked 3.2 days, approximately how much did you make per hour (assume an 8-hour day of work)?
Answer:
Amount of money paid for per hour = $27.34.
Explanation:
Amount of money paid = $700.
Number of days of work = 3.2
Amount of money paid for 1 day = Amount of money paid ÷ Number of days of work
= $700 ÷ 3.2
= $218.75.
(assume an 8-hour day of work)
Conversion:
1 day – 8 hours.
Amount of money paid for per hour = Amount of money paid for 1 day ÷ 8
= $218.75 ÷ 8
= $27.34.
Question 12.
The production rate for widgets in the factory is 8 per second. How many widgets should you make in a 9-hour shift?
Answer:
Number of widgets should you make in a 9-hour shift = 32,400 seconds.
Explanation:
Production rate for widgets in the factory per second = 8.
Conversion:
1 hour = 3,600 seconds.
Number of widgets should you make in a 9-hour shift = ?? seconds.
=> 1 × ?? = 9 × 3,600
=> ?? = 32,400 seconds.
Question 13.
What is the maximum of different centuries that a person can live in if he lived to be 110 years?
Answer:
1.1 centuries is the maximum of different centuries that a person can live in if he lived to be 110 years.
Explanation:
Maximum of different centuries that a person can live in if he lived to be 110 years= ??
Conversion:
1 century = 100 years.
?? centuries = 110 years
=> 1 × 110 = 100 × ??
=> 110 ÷ 100 = ??
=> 1.1 centuries = ??
Question 14.
If you get paid $8.00 per hour and you work 5,400 minutes, how much will you earn?
Answer:
Amount of money earned = $720.
Explanation:
Amount of money paid per hour = $8.00.
Number of minutes you worked = 5,400.
Conversion:
1 hour = 60 minutes.
?? hours – 5,400 minutes
=> 1 × 5,400 = 60 × ??
=> 5,400 ÷ 60 = ??
=> 90 hours = ??
Amount of money earned = Amount of money paid per hour × 90
= $8 × 90
= $720.