CHAPTER 10: MEASUREMENT – ARITHMETIC STANDARD II NOTES

CHAPTER 10: MEASUREMENT – ARITHMETIC STANDARD II NOTES

Unit of measuring time

Time can be given in different ways. It can be in years, months, weeks, days, hours, minutes and seconds.

A year has twelve months.

A month has four weeks.

A week has seven days.

A day has 24 hours.

One hour has 60 minutes.

One minute has 60 seconds.

Exercise

Match items on the left with items on the right.

READING TIME

Clocks are hung on the wall.

Watches are worn on the wrist.

Both clocks and watches help us to know the time.

To read time, observe the minutes and hour hands. Notice the numbers they are pointing at.

O’CLOCK

Time is o’clock when the minute hand points at 12. It is the beginning of the new hour. Read the number pointed at by the hour-hand. Then, add the word o’clock.

Examples: Study the following clocks and the time they show.

Exercise

Write the time shown by each clock below.

Exercise 2

Match the clocks with exactly time.

HALF PAST

The minute-hand can point at 6. We read it as half-past. First say half-past then say the hour.

Exercise

Write the time shown by each clock below.

EXERCISE 2

Show the time you are given. Do so by drawing the hour and minute hands.

QUARTER PAST

The minute-hand can be at 3. The time is quarter past the hour just before the hour-hand. For example

Exercise 1

Read and write the time shown by each clock below.

Exercise 2

Draw clock by showing the following Majuto’s daily timetable.

1. He wakes up at six o’clock.
2. He brushes his teeth at quarter past six
3. He takes breakfast at half past six.
4. He goes to school at seven o’clock.
5. He comes back from school at four o’clock.

MEASUREMENT OF LEGHT

Measuring length using standard units.

We use standard devices to measure length. For example a ruler and tap measure.

Length is measured in different units. They are centimetres (mm), metres (m) and kilometres (km).

Exercise

Use ruler to mesure the following

1. Distance of your desk. ______________ meters

2. Distance of your pencil. ____________ centimeters

3. Distance of your arithmetic text book. _____________ centimeters

4. Distance of your arithmetic exercise book. _____________ centimeters

CHAPTER 10: MEASUREMENT – ARITHMETIC STANDARD II NOTES

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