Reading the Scale of a Rule or Tape - Continued - 14256_21

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TM  9-243 READING  THE  SCALE  OF  A  RULE  OR  TAPE  -  Continued To  determine  the  number  of  64ths  in  3/4,  remember every  sixteen  divisions  or  16/64  are  equal  to  1/4  inch.  If 1/4  is  equal  to  16/64,  then  3/4  is  equal  to  48/64  as shown: If   1/4  =   16/64,   then   3/4  =  48/64 (16x3=48) 1 Locate  the  number  48  between   the  2  and  3  inch marks  on  the  scale. 2. Write  the  new  fraction  2-48/64. READING  A  METRIC  RULE The  metric  system  is  based  upon  multiples  of  ten.  For example,  there  are  10  millimeters  in  a  centimeter  and 100  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),  1/100 or  0.01  meter. Next  divide  a  centimeter  (cm)  by  10.  This  will  equal  a millimeter  (mm),  1/1000  or  0.001  meter. Now  let’s  look  at  a  section  of  the  rule  between  2  cm  and 3  cm. There are 10 equal divisions which are equal to 1/10 cm or 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  or from  metric  to  US  Common  may  be  found  inside  the back  cover  of  this  manual. 3-3/(3-4   blank)

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