http://www-k6.thinkcentral.com/content/hsp/math/hspmath/na/common/itools_int_9780547584997_/main.html?module=fractions&activity=15 (iTools:  Fraction Circles)

 

http://www-k6.thinkcentral.com/content/hsp/math/hspmath/go_math_2012/na/gr5/amm_9780547665054_/lesson.html?g_iGrade=5&g_iChapter=91&g_iLesson=13&strUserID=st1&g_iProduct=5&g_iSection=15 (Multiply Fractions with Whole Numbers)