Job Knowledge, Skill, and Ability Preferences: Ability to read and speak English may be required in order to perform the duties of the job (e.g. the associates may be required to communicate with English speaking customers or coworkers, the manuals for the equipment the associates may use are in English). Mathematical Skills: May be required: to add, subtract, multiply, and divided in all units of measure, using whole numbers, common fractions, and decimals; to compute rate, ratio, and percent and to draw and interpret bar graphs.