Measurement of Length
Category : 2nd Class
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.
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