Question

Multiply:

a) 3 hours 9 minutes 26 seconds by 6.
b) 4 years 9 months 16 days by 7.
c) 5 years 6 months 25 days by 6.
d) 2 hours 30 minutes 20 seconds by 4.
e) 6 hours 45 minutes 30 seconds by 7.

Answer 1

Subtracting units of time involves subtracting seconds from seconds, minutes from minutes, and hours from hours, and borrowing from the next higher unit if needed. Conversion from seconds to minutes requires division by 60, and further division by 60 to convert to hours.

Step-by-step explanation:

Multiplying and Subtracting Units of Time

To multiply units of time, you must individually multiply the hours, minutes, and seconds by the factor given. However, this particular question asks for subtraction of measurements of time, and then conversion of the units and fractional units of time.

• To subtract times, line up the hours, minutes, and seconds and then subtract each starting from seconds.
• If necessary when subtracting, borrow from the next higher unit if the smaller unit isn't sufficient.
• To convert seconds to minutes, divide by 60, since there are 60 seconds in a minute.
• To convert minutes to hours, divide by 60 again, since there are 60 minutes in an hour.

Examples:

1. Subtract the minutes: 35 minutes - 10 minutes = 25 minutes.
2. For conversion of seconds into minutes: 3000 seconds ÷ 60 = 50 minutes.
3. For conversion of seconds into hours: 6000 seconds ÷ 3600 (the number of seconds in an hour) = 1.6667 hours.