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Wednesday, 26 March 2014

subtraction and addition


293-88=295      431-99=331       118-32=114     235-89=326     225-77=308     
+2  +2              +1   +1              +2   +2            +1   +1            +3  +3
295-90=295      431-100=331     120-34=114     236-90=326     228-80=308

515-398=117    232-88=164       187-41=154      234-52=118          136-67=131
+2  +2              +2  +2               +3   +3             +6  +6                  +3  +3
517-400=117    234-90=164       190-44=154      140-58=118          140-71=131

232-52=222     187-41=147        234-52=122      136-67=132          234-77=317
+3  +3              -1 +1                 -2    +2             +3  -3                   -3    +3
237-55=222      188-42=147       132-54=122      132-64=132          231-74=317

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