TM 9-243READING THE SCALE OF A RULE OR TAPE - ContinuedTo determine the number of 64ths in 3/4, rememberevery sixteen divisions or 16/64 are equal to 1/4 inch. If1/4 is equal to 16/64, then 3/4 is equal to 48/64 asshown:If 1/4 = 16/64, then 3/4 = 48/64(16x3=48)1Locate the number 48 between the 2 and 3 inchmarks on the scale.2.Write the new fraction 2-48/64.READING A METRIC RULEThe metric system is based upon multiples of ten. Forexample, there are 10 millimeters in a centimeter and100 centimeters in a meter.The example provided will deal only with millimeters(mm).The meter will become the starting point and from-this,two additional scales can be developed for measuring.A meter divided by 100 equals a centimeter (cm), 1/100or 0.01 meter.Next divide a centimeter (cm) by 10. This will equal amillimeter (mm), 1/1000 or 0.001 meter.Now let’s look at a section of the rule between 2 cm and3 cm.There are 10 equal divisions which are equal to 1/10 cmor 1 mm.To measure 26 mm, first locate the longest line desig-nated 2 cm or 20 mm.Next count 6 additional lines to find 26 mm.A table for converting from US Common to metric orfrom metric to US Common may be found inside theback cover of this manual.3-3/(3-4 blank)
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