## 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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