I feel that I can divide the least count into 5 segments. How would I express my uncertainty of this ruler with one significant digit?

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

George writes the mixed number as sum and uses the distributive property 1/2.-2/5=1/2-2+2/5=1/2

Awoman who is 64 inches with a shoulder width of 16 inches. write an equation relating the height h to the width w. find the height of a woman who has ashoulder width of 18.5 inches