Addition problems (4)
I believe the answer is:
sums
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">addition problems</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sums that I've seen before include "Exercises in arithmetic" , "Quantities obtained by addition" , "Amounts of money" , "Calculations" .)