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Mathematics 15 Online
OpenStudy (anonymous):

129+375=? Compensation needed as if you -3 off one number then you have to +3 to the other number to make it easir to do mentally!

OpenStudy (anonymous):

got it. subtract 25 from 129 = 104 add 25 to 375 = 400 400+104 = 504

OpenStudy (anonymous):

Thanks and I checked and did the work extremely helpful!

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