The three-digit addition is same as two-digit addition. From left to right!! So lets start!
552 + 214
214 can be written as 200 + 10 + 4. So let's start adding
552 + 214
(add 200)
= 752 + 14
(then add 10)
= 762 + 4
(then add 4)
= 766
623 + 159
159 can be written as 100 + 50 + 9.
623 + 159
(add 100)
= 723 + 59
(then add 50)
= 773 + 9
(then add 9)
= 782
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