(1) Cranmer abacus-adding by 10-easy rules – YouTube
Dr Denisehttps://www.youtube.com/watch?v=lWYOPshaI1M
(1) Cranmer abacus-subract by 2-learn the rules – YouTube
https://www.youtube.com/watch?v=M9XVJkQ6gM0
(1) Cranmer Abacus-subtract by 3-learn the rules – YouTube
https://www.youtube.com/watch?v=Oz4--cxfeTo
(1) Processing 0% Cranmer Abacus-subtract by 4-learn the rules – YouTube
https://www.youtube.com/watch?v=68DYaR89qoM
(1) Cranmer Abacus-subtract by 5-learn the rules – YouTube
https://www.youtube.com/watch?v=vVwlltrhTG0
(1) Cranmer Abacus-subtract by 5-learn the rules – YouTube
https://www.youtube.com/watch?v=vVwlltrhTG0
(1) Cranmer Abacus-subtract by 6-learn the rules – YouTube
https://www.youtube.com/watch?v=KHkMEvHKVgs
(1) Cranmer Abacus- Subtract by 7-learn the rules – YouTube
https://www.youtube.com/watch?v=MnQmPvEwzFo
(1) Cranmer Abacus- Subtract by 8-learn the rules – YouTube
https://www.youtube.com/watch?v=OG7gNWzZHhg
(1) Cranmer Abacus- Subtract by 9-learn the rules – YouTube
https://www.youtube.com/watch?v=WJZv5WG9PJs