Peter F. answered 08/24/20
Multi-level Elementary Math Teacher; 18 Years' Teaching Experience
Hi Kathy,
They are first asking you to actually add 16+4, since the question asks which number 16 is 4 numbers less than. When you add 16+4, you get 20. 20-4=16, so there's your answer there.
Actually, 16-6 is the correct reiteration for "16 is 6 more than...(what number)?" Since 16-6=10, 16 is therefore 6 numbers more than the number 10.
I hope this helps clarify any confusion! :)

Peter F.
08/24/20
Kathy G.
Thank you for the clarification Mr. Peter.08/24/20