Study Jams Video (adding and subtracting decimals): http://studyjams.scholastic.com/studyjams/jams/math/decimals-percents/add-sub-decimals.htm
Study Jams Video (multiplying decimals): http://studyjams.scholastic.com/studyjams/jams/math/decimals-percents/mult-of-decimals.htm
Dividing Decimals
Helpful videos: https://learnzillion.com/lesson_plans/8924
https://mathantics.com/section/lesson-video/dividing-fractions
Study Jams Video (multiplying decimals): http://studyjams.scholastic.com/studyjams/jams/math/decimals-percents/mult-of-decimals.htm
Dividing Decimals
Helpful videos: https://learnzillion.com/lesson_plans/8924
https://mathantics.com/section/lesson-video/dividing-fractions