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Why are some of the supplementary books called U.S. edition?

April 26, 2017Books called edition Supplementary

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Why are some of the supplementary books called U.S. edition?

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Primary Mathematics Challenging Word Problems, Extra Practice for Primary Mathematics, and Primary Mathematics Intensive Practice all follow the sequence of topics in Primary Mathematics U.S. Edition, include some problems with customary measurement, and use American spelling and conventions. The other supplements (i-Excel Heuristic and Model Approach, MathExpress Speed Maths Strategies and Brain Maths have not been revised, and do not follow the sequence of topics in Primary Mathematics U.S. Edition and have some words with British spellings and conventions (e.g. period instead of colon in time: 5.00 for 5 oclock; space instead of commas for thousands: 45 600).