can count on no hands
v. phr.— «Speedskater Chad Hedrick says he can count on “no hands” the number of times he’s been in the weight room this year. But Hedrick needs all five fingers to tick off the events he’s qualified for in the Winter Olympics.» —by Karen Rosen in Kearns, Utah United States Olympic Committee Jan. 1, 2006. (source: Double-Tongued Dictionary)
Further reading
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...
Mary Beth in Greenville, South Carolina, wonders: Why do we say four-oh-nine for the number 409 instead of four-zero-nine or four-aught-nine? What are the rules for saying either zero or oh or aught or ought to indicate that arithmetical symbol...