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You could align the edge of the object with the zero on the ruler and then read off the marking on the ruler which aligned with the other end of the object.
A ruler (some say it should be called a rule!) is marked along an edge with (nowadays) centimetres and millimetres. Place the zero mark on the ruler at the start of the object to be measured, and read off the measurement at the other end of the object.
ALL of the fractions on a ruler are between the zero end and the ' 1 ' mark. Since there are an infinite number of them, it's not possible to label all of them, so NONE of them are labeled. 'Three fourths of an inch' is located 3/4 of the distance from the zero end to the ' 1 ' mark. Some rulers have a mark there. Others don't. 'Three fourths of a foot' is the mark labeled ' 9 '.
Put the ruler down on it. Then put your finger at one end of the ruler, and move the other end of the ruler to your finger. Do this again. The end of the ruler will be 90cm from where you started.
Front end rounding is to the largest place. Since the number to the right of that is less than 5, we zero it and everything to the right of it out. Answer: 10,000