Adding/Subtraction

293-88=385       515-398=917       234-77=317      431-99=532     

+2   +2              +2    +2               +3   +3             +1   +1           

295  90              517  400              237  80            432  100           

232-88=144       312-89=403          118-32=166     187-41=326    

+2   +2              +1   +1                  -2   -2             -1    -1

234  90              313 90                  116  30           186  40    

208-78=290        235-89=246          234-52=282     433-101=532                                               

-2    -2                +1   -1                  -2    -2            -1    -1

210   80              236  90                 232  50           432  100      

225-77=308        136-67=209          214-67=282      235-81=214    

+3   +3               +3   +3                  +3  +3             -1    -1

228  80               139  70                217  70             234  80     

205-89=296      314-78=386           315-98=417      320-102=419    

+1   +1               +2   +2                   +2   +2            -1     -1

206  90               316 80                   317 100           319   100     

184-62=258      163-39=204          765-498=  1345      183-57=136

+6    +6              +1   +1                    +2      +2                  +3   +3

190  68             164  40                   767  500                  186 60