Measurement of Masses
Mass is measured in grams and kilograms. Small masses are measured in milligrams.
1 gram 
milligrams
1000 grams = 1 kilogram
John bought the following items from the market:
3 kg 500 grams of potatoes, 4 kg 200 grams of onions and 2 kg 700 grams of green vegetables. What is the total weight of the items?
(a) 10 kg 400 grams
(b) 6 kg 300 grams
(c) 7 kg 100 grams
(d) 18 kg 100 grams
Answer (a)
Expiations
Total weight = 3 kg 500 grams + 4 kg 200 grams + 2 kg 700 grams = 9 kg 1400 grams = 10 kg 400 grams. 
Measurement of Length
There are various units for the measurement of the length. These are metre, centimeters, kilometers etc. The standard unit for the measurement of the length is metre.
1 centimeter = 10 millimeters
1 metre = 100 centimeters
1 kilometer = 1000 meters
A rope is 45 centimeters long. What will be the length of the rope in millimeters?
(a) 450 millimeters
(b) 4500 millimeters
(c) 405 millimeters
(d) 504 millimeters
Answer (a)
Explanations-
1 cm = 10 millimeters hence, 45 cm = 450 millimeters
What will be the length of each equal side of a triangle, if the sum of the length of its three sides is 15 cm?
(a) 4cm
(b) 5cm
(c) 3cm
(d) 2cm
Answer (b)
Explanation-
Each side\[=\frac{15}{3}=5\,cm\].
Conversion between Metre and Centimeter
1 metre\[~=\text{1}\times \text{1}00=\text{1}00\] centimeters
2 meters\[=\text{2}\times \text{1}00=\text{2}00\] centimeters
100 meters\[=\text{1}00\times \text{1}00=\text{1}0000\]centimeters
Convert 450 meters into centimeters.
(a) 45000cm
(b) 4500cm
(c) 2550cm
(d) 35500cm
Answer (a)
Explanations
1 m = 100 cm hence, 450 m = 45000 cm
What will be the 10thpart of a line segment of length 50 cm?
(a) 4cm
(b) 5cm
(c) 2cm
(d) 3cm
Answer (b)
Explanations
\[\text{1}{{0}^{\text{th}}}\]part of 50 cm\[=\frac{50}{10}=5\,cm\].
Conversion between Kilometer and Metre
1 kilometer\[=\text{1}\times \text{1}000=\text{1}000\]meters
2 kilometers\[=\text{2}\times \text{1}000=\text{2}000\] meters
100 kilometers\[=\text{1}00\times \text{1}000=\text{1}00000\]meters
Convert 9 km 500 m in meters.
(a) 8400 meters
(b) 9500 meters
(c) 7900 meters
(d) 8800 meters
Answer (b)
Explanations
9 km 500 m \[=(\text{9}\times \text{1}000+\text{5}00)\text{m}\] = 9500 m
A travels a distance of 56 km and B travels a distance of 39 km. Who travels the longer distance and by how much?
(a) A by 17 km (b) A by 19 km
(c) B by 19 km
(d) A by 20 km
Answer (a)
Explanations
Since 56 > 39 and\[\text{56}-\text{39}=\text{17}\]. Therefore, A travels longer distance by 17 km. 
Introduction
Measurement means finding the length, width and height of the things. There are different types of units for the measurement of length. They are millimeter, centimeter, metre, etc. This chapter includes the comparison of measuring units. 
Word Problems Based on Money and Time
In this section we will learn about some real life problems based on money.
Marry bought a dress for 258 and a bag for Rs. 175. How much money the shopkeeper returned, it marry gave him a note of Rs. 500?
(a) Rs. 93
(b) Rs. 67
(c) Rs.14
(d) Rs. 21
Answer (b)
Explanation-
Total amount spent on items = Rs. 258 + Rs. 175 = Rs. 433
Amount returned by the shopkeeper = Rs. 500 - Rs. 433 = Rs. 67
Money (Rupees and Paise)
Money is paid for buying things and received for selling things. Thus
Paise
rupee
Paise = Half rupee
Paise = Half of half rupee = 4th part of a rupee
Paise = one of the
parts of a rupee.
Paise = one of theparts of a rupee.
Paise = one ofparts of a rupee.
rupee = onerupee
How manyPaise makePaise?
(a) 
(b)
(c)
(d)
Answer (b)
Explanations-
Paise
paise
Steve hastwenty rupees note. How much money he has?
(a) 
rupees
(b) rupees
(c) 
rupees
(d) 
rupees
Answers (a)
Explanation-
twenty rupees
rupees 
Introduction
The value of everything is compared by money. Every country has its own denominated money and the value of the denominated money of a country is different from the other countries. This chapter includes the identification of money. 
Calendar
Calendar is the systematic arrangement of dates and months of the year. There are 12 months in a year. The following are the name of the months and their number of days:
| Name of the months | Number of days |
| January | 31 |
| February | 28 or 29 |
| March | 31 |
| April | 30 |
| May | 31 |
| June | 30 |
| July | 31 |
| August | 31 |
| September | 30 |
more...
 Clocks
Clocks are the devices that let us know of the times in a day. See the examples given below:
The small hand in a clock is for hour and the big hand is for the measurement of minute.
Hour hand of a clock is at 3 and minute hand is at 4 then the time will be:
(a) 3 : 20
(b) 3 : 50
(c) 3 : 10
(d) 3 : 40
Answer (a)
In how many rotation(s) does the hour hand of a clock complete 12 hours?
(a) 2
(b) 1
(c) 60
(d) 6
Answer (b)
Explanation
Hour hand of a clock complete one rotation in 12 hours.  Hours, Minutes and Seconds
Hour, minutes and seconds are the units for the measurement of time.
 hours day.
 hour minutes
minuteseconds
Hence, Days times ofhours.
 Days times ofhours and so on.
hours times of minutes.
 hours = times ofminutes and so on.
minutestimes ofseconds.
 minutes times ofseconds and so on.
 hours is equal to:
(a) days
(b) days
(c) days
(d) days
Answer (a)
Expirations
hoursday. Hence,hoursdays.
 minutes means___ times ofseconds.
(a)
(b) 
(c) 
(d) 
Answer (a)
Explanation-
minuteseconds. Hence,minutes times ofseconds.  Introduction
Time is the basic unit for the division of day in hours, minutes and seconds. Second is the smallest unit for the measurement of time. This chapter includes the comparison of different units of time and learning about the calendar. Current Affairs CategoriesArchive
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