The document presents the final report of the Initial Learning in Mainstreaming Project, which developed and tested instructional techniques in 14 specific mathematics skill areas with 429 handicapped and normal elementary school students in Grace and Soda Springs, Idaho. Skill areas included addition facts; subtraction facts; carrying (regrouping); borrowing (regrouping); multiplication facts; division facts; multiplication processes to three digits; long division process to remainder; least common denominator; off base 10 (time: hours, minutes, seconds); off base 10 (time: years, months, weeks, days); rounding numbers; one variable story problems; and long division process with remainder as a fraction and decimal. (DLS)