Measurements

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Measurement is the process of finding out the size, length, weight, or amount of something. For example, we measure how long a book is or how heavy a bag of rice is.

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We need standard units so that everyone measures things the same way. For example, if one person uses their hand span and another uses a ruler, they might get different results for the same object.

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The cubit was an old unit of length. It measured the distance from the tip of the finger to the elbow. People used it to measure cloth or buildings, but it was not accurate because everyone's arm is d…

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Hand span and foot span are not standard because they differ from person to person. One person’s hand may be longer than another’s, so the measurement won’t be the same.

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The standard unit of length is the metre (m). Smaller lengths are measured in centimetres (cm), and longer distances like between cities are measured in kilometres (km).

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Place one end of the pencil at the 0 mark on the ruler. See where the other end reaches. If it ends at 12 cm, then the pencil is 12 cm long.

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Each small line is 1 mm. So 4 lines = 4 mm. The length is 7 cm and 4 mm, which can also be written as 7.4 cm.

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We would use centimetres (cm) to measure the length of a mobile phone because it is a small object.