Maharashtra Board Class 4 Maths Part One Chapter 8 Measuring Time PDF Download

8. Measuring Time

Telling The Time: Revision

What is the time?

The hour hand is between 1 and 2 and the minute hand is at 6. It means that the time is 30 minutes past 1.

Write the time shown by the clocks below in hours and minutes.

45 minutes past 1

Read the time given in the boxes below and draw the position of the clock hands.

10 minutes past 5

15 minutes past 12

35 minutes past 8

25 minutes past 4

Make a model of a clock. Arrange an exhibition of the models of clocks.

Teacher's Note

You can use a paper plate to make a clock. Draw numbers 1 to 12 on it. This is like making a clock at home in India.

Exam Trick

Remember: The minute hand points to 6 means 30 minutes. The minute hand points to 3 means 15 minutes. Just like counting on your fingers!

Points to Remember

The hour hand is short and the minute hand is long.
When the minute hand points to 6, it is 30 minutes past the hour.
When the minute hand points to 12, it is the exact hour.
We read time by looking at both hands together.
The time changes every minute.

Using The Terms 'A Quarter Past', 'Half Past' And 'A Quarter To'

1 hour = 60 minutes

Half an hour = 30 minutes

After 12 o'clock, we start measuring time again from 1.

A quarter of an hour = 15 minutes

Three quarters of an hour = 45 minutes

The hour hand is between 1 and 2 and the minute hand is on 3. It is 15 minutes past 1. One hour and a quarter hour has passed. It is a quarter past 1.

The hour hand is between 2 and 3 and the minute hand is on 3. It is 15 minutes past 2. Two hours and a quarter have passed. It is a quarter past 2.

In the same way, we also say 'quarter past 3', 'quarter past 4', ....'quarter past 12.'

It is thirty minutes past 2. When two hours and a half hour have passed, we say it is half past 2. Thirty minutes past 1 is the same as half past 1.

It is 30 minutes past 3 in the clock. 3 full hours and one half hour have passed. It is half past 3.

In the same way, we can say 'half past 4', 'half past 5', ...., 'half past 12.'

It is 45 minutes past 1. A quarter of an hour less than 2 can also be read as 'a quarter to 2'.

It is 45 minutes past 12. This can also be read as 'a quarter to 1'.

In the same way, we also say, 'a quarter to 3', 'a quarter to 4', ...., 'a quarter to 12'.

Exercise

Fill in the blanks.

(1) Quarter past 3 = 15 minutes past 3

(2) 15 minutes past 4 = ............... 4.

(3) Quarter past 5 = □ minutes past □

(4) 45 minutes past 6 = ............... 7.

(5) Quarter to 10 = □ minutes past □

(6) 30 minutes past 9 = ............... 9.

Teacher's Note

Quarter means 1/4 of an hour. Half means 1/2 of an hour. Your mother spends a quarter of an hour cooking dal.

Exam Trick

Remember: Quarter past = 15 minutes. Half past = 30 minutes. Quarter to = 45 minutes. Think of pizzas cut into 4 pieces!

Points to Remember

A quarter past means 15 minutes past.
Half past means 30 minutes past.
A quarter to means 45 minutes past.
After the hour, we add the minutes.
These terms make telling time easier.

The Calendar: Revision

Study this page of a calendar and answer the questions.

(1) How many days does August have?

(2) This year, on which day of the week is Independence Day?

(3) How many Mondays does this month have?

(4) Which dates fall on Thursdays?

(5) In August, which days occur five times?

(6) How many days pass before the same day of the week is repeated?

Measuring A Period Of Time

(1) Surekha went to her uncle's village in May. She went swimming every day from the 9th to the 25th of May. How many days did Surekha go swimming?

To find it out, let us count the days from the 9th to the 25th.

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Surekha went swimming for 17 days.

(2) John's school vacation started on the 5th of May and school started again on the 12th of June. How many days' vacation did John have?

The vacation started on the 5th of May. May has 31 days.

After the 4th of May up to the 31st, there are 31 – 4 = 27 days.

School started on the 12th of June. It means that the vacation continued from the 1st of June to the 11th of June, for 11 days.

The period of the vacation was of 27 + 11 = 38 days.

Exercise

Solve the following problems.

(1) In a certain year, the Ganesh festival started on the 9th of September and ended on the 18th of September. For how many days was the festival celebrated?

(2) Seema reached her hometown for Deepawali on the 12th of November and stayed there till the 1st of December. How many days did she spend there?

(3) A school trip was from the 5th of December to the 10th of December. How many days was it?

(4) Shyamrao had milk delivered to his home from the 5th of November to the 5th of December. How many days was milk delivered?

Teacher's Note

When you count days between two dates, do not count the first day. In India, many festivals last for many days like Navratri.

Exam Trick

Remember: Count from day 1 to day 2 = 1 day, not 2 days. Do not count the starting day. Just count forward like climbing stairs!

Points to Remember

May has 31 days and June has 30 days.
When counting days, we do not count the first day.
We add remaining days of one month to days of next month.
A calendar helps us find the number of days.
Different months have different numbers of days.

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