Learn to read, tell the time and write the time from analogue  (Page 6/4)

Mathematics

Grade 4

Measurement, space and shape

Module 10

Learn to read, tell and write the time from analogue clocks

Activity 1:

TIME

• We know that there are $\text{365}\frac{1}{4}$ days in one year. For your calculations in this module you may use 365 days in a normal year and 366 days in a Leap Year. A Leap Year occurs every 4 years (four quarter days = 1 whole day). A Leap Year may be identified by dividing the last two digits of the year by 4. If there is no remainder, the year is a Leap Year. The year 2004 was a Leap Year. The extra day is always put in February.

There are 24 hours in one day. There are 7 days in a week

There are 60 minutes in an hour. There are 12 months in a year

There are 60 seconds in a minute.

SHORT FORMS:

year = a

day = d

hour = h

minutes = min. (remember: m = metres!)

seconds = s

month = mo

week = wk

In this module we shall also come across tenths and hundredths of a second!

Analogue clocks and watches show twelve hours only. They do not indicate whether it’s morning or afternoon.

Every hour the long hand goes right round the circle once. It counts the minutes.

The long hand tells us the minutes.

The short hand tells us the hour.

The short hand takes twelve hours to go round the circle once. It tells us the hour.

1. Write down the time on each of the clocks:

Hands on: practical work

On the next page you will find two circles. Cut out the first one. Fold it in half. Open it and shade one half. Write PAST in the half on the right and TO in the half on the left. Now paste your cut-out on the circle below.

TO

PAST

When we read the minutes, the first half of the circle shows minutes past the hour. When the long minute hand has gone halfway round the circle, we say it is half past the hour. The second half shows minutes to the next hour.

Now cut out the second circle on the “cutting page” page. Fold it in half and in half again. Open the circle and draw dotted lines on the folds. We have divided the hour into 4 quarters. So we get a quarter past the hour and a quarter to the next hour. Write A QUARTER PAST on the right side and A QUARTER TO on the left side and paste your cut-out on the circle below.

A QUARTER TO

A QUARTER PAST

for cutting out

Read the instructions very carefully; be sure you understand before you do each step.

Now we are going to write in the hours on the clock face. On the next page there are two more circles for you to cut out. Cut out the first one. Fold it in half. Fold it in half again. Do not open it. Now, fold the quarter in three (like an ice-cream cone). Can you predict how many parts there should be when you open it?

Yes, there should be 12 marks. Start with the top mark and label it inside the circle: 12. Then work clockwise and number each fold in the circle. (Your spaces between each number should be accurate because you made folds.) You have now written in the hours. Mark each fold at the edge of the circle and write in the number of the hour. (The first one has been indicated.) Paste it on the first circle on this page.