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With considerable difficulty!

With a 30 cm ruler you can easily ascertain that the length is between 2 and 3 ruler-lengths: 600 mm and 900 mm. Maybe you can judge that the the remainder, after 600 mm is less than half of the 30 cm ruler. So that tells you that it is between 600 mm and 750 mm.

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11y ago
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Jacob DaLal

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3y ago

well i aint know

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Q: How do you measure 720 mm with a 30 cm ruler?
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How can you measure a 650 mm ribbon with a 30 cm ruler?

1 cm = 10 mm. Start with ruler at 0 and mark ribbon at 30 cm. Then place ruler at the mark and measure 30 cm more and make another mark- you are up to 60 cm or 600 mm. Then place ruler at this mark and measure 5 cm, or 50 mm. Now you have a 650 mm ribbon.


Why the meter ruler is not suitable to measure the length of classroom?

Why? Because A ruler of 30 cm is not enough for a bigger class! you need a meter ruler and multiply each ok.


What would you use to measure the length of a classroom'is it a meter ruler or a 30cm ruler?

You could use either, it's just a little more work with the 30 cm ruler, but the result will be the same.You could use either, it's just a little more work with the 30 cm ruler, but the result will be the same.


How many centimeters is 1ruler?

For a small ruler . There are 15 cm in 1 ruler. wheras a big ruler has 30 cm in a ruler.


Is a meterstick a perfect tool to measure the dimensions of a magazine cover?

No, a metre stick is adequate, but a 12 inch or 30 cm ruler would be handier and possibly perfect.No, a metre stick is adequate, but a 12 inch or 30 cm ruler would be handier and possibly perfect.


What kind of ruler was King James you?

he was a 30 cm ruler... green too


What is a suitable instrument to measure between 1 cm to 10 cm?

An ordinary ruler.


How do you measure the radius of a circle in cm?

Use a metric ruler.


What instrument measures cm and mm?

A ruler or tape measure.


What do you use to measure the length of an object?

a ruler is used to measure it and cm, sometimes inches to


When do you use the metric ruler?

metric ruler is used for measuring the length of the objects in mm and cm. hence ,1cm=10 mm.In metric ruler =15 cm.


How many lines are there in inch and cm of a ruler?

A standard metric ruler is just slightly longer than 30 centimetres and slightly longer than 12 inches.The "slightly longer" is for the extra bits of ruler that stick out in front of the 0 (zero) cm/in at the beginning of the ruler and behind the 30 cm/12 in mark at the end of the ruler