Time Flashcards

All 6 cards in this deck

How do you convert a number of minutes into hours?

e.g. 78 minutes

Divide by 60.
$78 \div 60 = 1.3$ hours

How many seconds are there in one hour?

$3600$, since $60 \times 60 = 3600$.

True or false? A time of $2.75$ hours is 2 hours 75 minutes.

False. $0.75 \times 60 = 45$, so it is 2 hours 45 minutes.

How is 2:45 pm written as a 24-hour time?

14 45

What are the steps to find how long a journey lasts from its two 24-hour times?

e.g. 13 30 to 14 48

1. Count on to the next whole hour: 13 30 to 14 00 is 30 min
2. Count on to the finish: 14 00 to 14 48 is 48 min
3. Add: $30 + 48 = 78$ min $=$ 1 hour 18 minutes

When working out a speed in km/h, what must you do with a time given in hours and minutes?

e.g. 1 hour 18 minutes

Change it into hours as a decimal: $1 + 18 \div 60 = 1.3$ hours.