Reviewing on measurement

### 1.1. Knowledge to remember

**a. Kg**

**b. Liter**

**c. Date, time**

**d. Date**

How to read information about the number of days, things … in a monthly calendar.

### 1.2. Math forms

**Type 1: Read the mass of the object on the balance.**

Determine where the scale’s needle is pointing and then read the weight of the object.

**Type 2: View the monthly calendar and then answer the questions.**

Read the information on a given monthly calendar and then answer the questions.

**Form 3: Watch the time**

Locate where the hour and minute hands are pointing and then read the hours respectively.

### 1.3. Solving Textbook Exercises

**Lesson 1**

a) How many kilograms does the duck weigh?

b) How many kilograms does a packet of sugar weigh?

c) How many kilograms does Lan weigh?

__Solution method__

a) Determine which number the hand of the scale is pointing at.

b) The mass of the sugar pack is equal to the mass of the 5kg weight minus the 1kg weight.

c) Look at the picture and then read Lan’s weight.

__Solution guide__

a) The duck weighs 3kg

b) Sugar pack weighing 4kg

c) Lan weighs 30kg

**Lesson 2**

Check the calendar and say:

a) How many days are there in October? How many Sundays are there? What days are those?

b) How many days are there in November? How many Sundays are there? How many Thursdays are there?

c) How many days are there in December? How many Sundays are there? How many Saturdays are there? I have Sundays and Saturdays off, so how many days do I have in December?

__Solution method__

Look at the calendar and then answer the math questions.

__Solution guide__

a) October has 31 days. There are 4 Sundays that are the 5th, 12th, 19th, and 26th.

b) November has 30 days. There are 5 Sundays which are the 2nd, 9th, 16th, 23rd, 30th. There are 4 Thursdays which are the 6th, 13th, 20th and 27th.

c) December has 31 days. There are 4 Sundays which are 7th, 14th, 21st and 28th. There are 4 Saturdays which are 6th, 13th, 20th, 27th. So in December I have 8 days off.

**lesson 3**

Look at the calendar in lesson 2 and say:

a) What day is October 1st?

What day is October 10?

b) What day is November 20?

What day is November 30?

c) What day is December 19?

What day is December 30?

__Solution method__

Look at the calendar and then answer the math questions.

__Solution guide__

a) October 1 is a Wednesday

October 10 is Friday

b) November 20 is a Thursday

November 30 is a Sunday

c) December 19 is a Friday

December 30 is a Tuesday.

**Lesson 4**

a) What time do you salute the flag?

b) What time do you exercise?

__Solution method__

See the time on each clock.

The minute hand points to the number 12, the hour hand points to any number, it is the hour of the clock.

__Solution guide__

a) You salute the flag at the beginning of the week at 7 o’clock.

b) You do physical education at 9 o’clock.

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