# Grade 4, Maths Olympiad (CBSE) - Time

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Grade 4 | Maths | Time, Money, Time and Calendar, Olympiad, CBSE, ICSE, SOF, ITO

**Time**

We use clock or watch to know time.

There are 3 hands in a clock - hour, minute and second hand.

The hour hand is shortest and slowest moving. It completes one full rotation in 12 hours.

The minute hand is the longest. It completes 1 full rotation in 1 hour.

The second is the thinnest. It is the fastest moving hand. It completes one rotation in 1 minute.

**60 seconds=1 Minute**

**60 Minutes=1 Hour**

**24 Hours=1 Day**

**Reading time :**

- Look at hour hand. If it's in the middle of a number or ahead of the middle of a number then number corresponds to the currently running hour.
- Look at the minute hand. Entire rotation of minute hand can be divided into 60 parts (marks). These 60 marks are further divided into 12 parts (numbers). Each number denotes 5 marks. Thus if the minute hand is on 2 it means 2 X 5=10 minutes.

E.g.

**1.** The hour hand is slightly ahead of the middle of 7 and the minute hand is at 3. It means currently running hour is 7. As the minute hand is on 3 it means 3 X 5=15 minutes. So time is 15 minutes past 7 or Quarter past 15 minutes.

**2. **The hour hand is reaching towards the middle of 6 and the minute hand is at 9. As hour hand has not reached the middle of 6 but reaching towards it, currently running hour is 5. As the minute hand is on 9, it means 9 X 5=45 minutes. So the time is 45 minutes past 5. As it is only 15 minutes (60-45) left to reach 60 and complete the 6th hour we can also say that it is quarter to 6.

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