what three points must you keep in mind while measuring a length with a ruler
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Answer:keep the startibg point, 0at the starting point of what u want to measure.
If it is a pen, keep 0in the tip of it.measure its length till its end.
If it is a longer object umay need a long ruler
Explanation:hope this helps....
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1) if it is a pen keep on the tip of it measure it length till its ends
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