Practice questions available in McGraw Hill Math Grade 6 Answer Key PDF Lesson 18.7 Time will engage students and is a great way of informal assessment.

Exercises
SOLVE
Question 1.
24 hours = ____________ seconds
24 hours = 1,440 seconds.

Explanation:
24 hours = ?? seconds
Conversion:
1 hour = 60 seconds.
24 hours = 60 × 24
= 1,440 seconds.

Question 2.
35 days = ____________ hours
35 days = 840 hours.

Explanation:
35 days = ?? hours.
Conversion:
1 day = 24 hours.
35 days = 24 × 35
= 840 hours.

Question 3.
365 days = ____________ minutes
365 days = 525,600 minutes.

Explanation:
365 days = ?? minutes.
Conversion:
1 day = 1,440 minutes.
365 days = 1,440 × 365
= 525,600 minutes.

Question 4.
12 hours = ____________ days
12 hours = 0.5 day or half a day.

Explanation:
12 hours = ?? days.
Conversion:
1 day = 24 hours.
12 hours = 12 ÷ 24
= 0.5 day or half a day.

Question 5.
52 weeks = ____________ days
52 weeks = 364 days.

Explanation:
52 weeks = ?? days.
Conversion:
1 week = 7 days.
52 weeks = 7 × 52
= 364 days.

Question 6.
51 hours = ____________ minutes
51 hours = 3,060 minutes.

Explanation:
51 hours = ?? minutes.
Conversion:
1 hour = 60 minutes.
51 hours = 60 × 51
= 3,060 minutes.

Question 7.
24 days = ____________ weeks
24 days = 3.4 weeks.

Explanation:
24 days = ?? weeks.
Conversion:
1 week = 7 days.
24 days = 24 ÷ 7
= 3.4 weeks.

Question 8.

Explanation:
Conversion:
200 years = 200 ÷ 10

Question 9.
3,000 years = ____________ centuries
3,000 years = 30 centuries.

Explanation:
3,000 years = ?? centuries.
Conversion:
1 century = 100 years.
3,000 years = 3,000 ÷ 100
= 30 centuries

Question 10.
42 days = ____________ minutes
42 days = 60,480 minutes

Explanation:
42 days = ??  minutes
Conversion:
1 day = 1,440 minutes.
42 days = 1,440 × 42
= 60,480 minutes

Question 11.
2 weeks = ____________ seconds
2 weeks = 12,09,600 seconds

Explanation:
2 weeks = ?? seconds
Conversion:
1 week = 604,800 seconds.
2 weeks = 604,800 × 2
= 12,09,600 seconds

Question 12.
45 minutes = ____________ hours
45 minutes = 0.75 hours.

Explanation:
45 minutes = ?? hours.
Conversion:
1 hour = 60 minutes.
45 minutes = 45 ÷ 60
= 0.75 hours.

Question 13.
If you got paid $800 and you worked 2.92 days, approximately how much did you make per hour? Answer: Amount paid per day =$11.42.

Explanation:
Amount paid = $800. Number of days = 2.92. Amount paid per day = Amount paid ÷ Number of days =$800 ÷ 2.92
= $273.97. Conversion: 1 day = 24 hours. Amount paid per day = Amount paid per day ÷ 24 =$273.97 ÷ 24
= $11.42. Question 14. How much do you have to pay a rock band that will play for 2 hours and wants to be paid$15/ second?
Amount paid for 2 hours = $108,000. Explanation: Number of hours = 2. Amount paid per second =$15.
Conversion:
1 hour = 3,600 seconds.
2 hours = 3,600 × 2
= 7,200 seconds.
=> Amount paid for 2 hours = Amount paid per second × 7,200
= $15 × 7,200 =$108,000.

Question 15.
Assume 365 days per year.

Explanation:
Conversion:
1 year = 365 days.
1 day = 24 hours.
=> 1 year = 365 × 24
= 8,760 hours.
= 10 × 8760 hours
= 87,600 hours.
3 decades = 87,600 × 3
= 262,800 hours.

Question 16.
A man tells you he is 2,270,592,000 seconds old. How many years old is he if you assume 365 days per year?
Number of years old a man is = 72.

Explanation:
Number of seconds old a man is = 2,270,592,000.
Conversion:
1 year = 365 days.
1 day = 24 hours.
=> 1 year = 365 × 24
=> 8,760 hours.
1 hour = 3,600 seconds.
8,760 hours = 8,760 × 3600
= 3,15,36,000 seconds.
Number of years old a man is = Number of seconds old a man is ÷ 3,15,36,000 seconds
= 2,270,592,000 ÷ 3,15,36,000 seconds
= 72.