hi How are you , will you kindly brake in detail the result of ÷×-or +. example 23x62__________what do they mean by lowest frequencies??

With lowest frequencies refers to the three least desirable options, in other words, the three with the fewest votes.
In this case the three with fewest votes are:
23
+67
85
-------
175 (3+7+5=15, we put five and add one to the tens) (2+6+8=16, we remember that we bring a unit of the units so we add it also 16+1=17)