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Match the signs with the problems

Match the signs with the problems

 
 
  • 1370 __?__ 1851 = 3221
  • 1916 __?__ 1415 = 3331
  • 1452 __?__ 1214 = 238
  • 1160 __?__ 1031 = 129
  • 1883 __?__ 1787 = 3670
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