Addition and Subtraction Websites:

 

 http://studyjams.scholastic.com/studyjams/jams/math/addition-subtraction/relate-add-and-sub.htm

https://jr.brainpop.com/math/additionandsubtraction/addingwithregrouping/

https://jr.brainpop.com/math/additionandsubtraction/subtractingwithregrouping/

http://studyjams.scholastic.com/studyjams/jams/math/addition-subtraction/sub-with-regroup.htm

https://www.youtube.com/watch?v=Y6M89-6106I

 

GAMES:

https://www.mathplayground.com/number_conundrum_whole.html

 https://www.mathplayground.com/brain_workouts/brain_workout_01_subtraction.html

https://www.education.com/game/two-three-digit-addition-science/

https://www.education.com/game/elliotts-museum-word-problems/ 

https://www.education.com/game/three-digit-addition-train/

https://www.education.com/game/three-digit-subtraction-mountain/