well, assuming you mean a regular centimetre ruler with 30 cm a yardstick would be longer, but if you meant metrestick, then the metrestick would be longer.
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You would use a ruler or a meterstick to measure the length of the strap on your book bag. A yardstick is typically used for larger measurements and may not be as precise for measuring smaller objects like a strap.
Centimeters are longer than millimeters. There are 10 millimeters in 1 centimeter.
One centimeter is longer than one millimeter. There are 10 millimeters in one centimeter.
On an inches ruler, you start measuring from the edge of the ruler. On a centimeter ruler, you begin measuring from the zero mark.
A metric ruler is divided into centimeters, with each centimeter further divided into 10 smaller units called millimeters. This allows for precise measurements in the metric system.