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The 5 (0.5 cm) is estimated.

If you have a ruler which has cm and mm (a millimeter is 0.1 centimeters) then you can measure and see that it's 1.5 cm, but at that 0.5 mark, you are estimating, because it the actual distance could really be 1.48 or 1.51 for example, but you are unable to determine that from this method of measuring. Actually, a person may be able to tell that it's either close to 1.5, and then could say 1.50 cm, or see that it's in between 1.5 and 1.4, and state that it's 1.45 cm. In those cases the last digit is estimated.

If it does not have millimeter markings, then a person could look at the measurement and say "it's about half way between 1 cm and 2 cm, then say it is 1.5 cm.

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13y ago
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Q: What is the estimated digit in 1.5 cm?
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