(1) Cranmer Abacus Using rules 1-5 to add quickly – YouTube
https://www.youtube.com/watch?v=QGGqCH7fZJc
February 2019
(1) Cranmer Abacus-subtract by 6-learn the rules – YouTube
https://www.youtube.com/watch?v=KHkMEvHKVgs
(1) Cranmer Abacus-adding by 7 -learn those rules – YouTube
https://www.youtube.com/watch?v=zKVLvZfj9zM
(1) Cranmer Abacus-adding by 8-learn the rules – YouTube
https://www.youtube.com/watch?v=DL4jLDKQC3M
(1) Cranmer Abacus-adding by 9-learn the rules – YouTube
https://www.youtube.com/watch?v=CJIWJFjITmg
(1) Cranmer abacus-adding by 10-easy rules – YouTube
https://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