Centimetre rulers are designed to measure small distances with a more accurate measurement/unit than say m or km. They have a smaller quanitity of distance therefore make them alot more accurate than higher units.
see , 1 standard ruler =15 cm . and we know that 1 km =100000 cm. That means ration of 15 cm and 100000 cm . no.of rulers =100000/15 =6666.66 that means 6666 rulers.
20 rulers
1 standard ruler =15 cm. Now, if it is 138 cm we will convert into no.of rulers. So,138/15 =9 rulers of 15 cm . 10 th ruler with 3 cm.
1 Meter = 100cm If We Are Using A 30cm Ruler, This means There is 3 1/3 Rulers Into A Meter Stick
It is not clear in history and it was build by many rulers
1 metre/30 cm = 100 cm/30 cm = 3.33... recurring.
One meter is equal to 100 centimeters. Since one ruler is typically 30 centimeters long, you can find the number of rulers in a meter by dividing 100 cm by 30 cm. This means that one meter is approximately equal to 3.33 rulers.
The approximate diameter of the field of a standard metric ruler is typically about 30 centimeters, as most metric rulers are designed to measure lengths up to 30 cm. However, there are longer rulers available that can measure up to 1 meter or more. The specific diameter of the field can vary based on the design and purpose of the ruler.
The Earth's circumference is approximately 40,075 kilometers, which is 40,075,000 meters. A 30 cm ruler is 0.3 meters long. To find out how many rulers are needed, divide the Earth's circumference by the length of the ruler: 40,075,000 meters ÷ 0.3 meters/ruler ≈ 133,583,333 rulers. Therefore, you would need about 133.6 million 30 cm rulers to measure the Earth's circumference.
They are not explicitly marked in normal rulers. But they are at the 10 centimetres (1 decimetre), 20 cm (2 dm) and 30 cm (3 dm) marks.
On a standard ruler, 0.4 cm is located between the 0 cm mark and the 0.5 cm mark. Rulers typically have small lines representing millimeters (mm), so 0.4 cm corresponds to 4 mm, which is the fourth line after the 0 cm mark. To find it, you can count four small lines to the right of the 0 cm mark.
On a ruler, 0.8 cm is slightly less than 1 cm. Since most rulers are marked in millimeters, you can find 0.8 cm by locating the 8th mark after the 0 cm line, as each centimeter is divided into 10 millimeters. It will be just a bit before the 1 cm mark.