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(1) Cranmer Abacus-adding by 9-learn the rules – YouTube
(1) Cranmer abacus-adding by 10-easy rules – YouTube
(1) Cranmer abacus-subract by 2-learn the rules – YouTube
(1) Cranmer Abacus-subtract by 3-learn the rules – YouTube
(1) Processing 0% Cranmer Abacus-subtract by 4-learn the rules – YouTube
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(1) Cranmer Abacus-subtract by 5-learn the rules – YouTube
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(1) Cranmer Abacus- Subtract by 7-learn the rules – YouTube
(1) Cranmer Abacus- Subtract by 8-learn the rules – YouTube
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