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.
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Well, honey, you can measure that 750mm ribbon with a 30cm ruler by simply lining it up three times and adding the measurements together. It's not rocket science, just basic math. So, get your ruler out, start measuring, and stop stressing over the small stuff.
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.
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.
Devide 30 by 4.875 that gives 6 pieces of ribbon 4.875 inches long and 0.75 inches of ribbon left over.
A 30 cm object might be a remote.