The word Ading is misspelled against Adding, which is present continuous of "Add"
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Adding has double "dd" is mispronounced as "d"
Remember double 'DD' in between the strings A & ing which should not be misspelled with single 'D'
Wrong Spelling:  A-d-ing 
Correct Spelling:  A-dd-ing 
Find more wrongly spelled words of Adding to spell it well.