19 Feb (1) Cranmer Abacus Using rules 1-5 to add quickly – YouTube
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19 Feb (1) Cranmer Abacus-subtract by 6-learn the rules – YouTube
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19 Feb (1) Cranmer Abacus-adding by 7 -learn those rules – YouTube
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19 Feb (1) Cranmer Abacus-adding by 8-learn the rules – YouTube
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19 Feb (1) Cranmer Abacus-adding by 9-learn the rules – YouTube
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