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Especially with imperial measurements, it’s tough to divide odd numbers accurately on the job site, without a calculator or a scratch pad.

Suppose you need to divide a length in half – and it’s something like 25′-13/16″. Can you do that quickly? Probably not.

Rob Koci shows you how a humble tape measure can do the math for you, in about 30 seconds.

How about dividing an odd width by 3? Or 5?

Rob shows you how a steel rule can also be used as a calculator, no matter what your measurements.

And finally, how about those tricky “inside to inside” measurements?

Bending a steel tape measure on the inside of a door or window frame and “guessing” the width is not the best method for a totally accurate reading.

So Rob shows you a better way to get deadly accurate inside-to-inside measurements.