how do i add ? here an example

Mathematics
Tutor: None Selected Time limit: 1 Day

like how do i add these? 10+75=? idont now 

Apr 6th, 2015

You add the singles column and then the tens column.

10 + 75 = 85

Hope that helps.

Apr 6th, 2015

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Apr 6th, 2015
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Apr 6th, 2015
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