Primary Mathematics offers U.S. Edition, Common Core Edition, and Standards Edition.

Primary Mathematics U.S. Edition
Almost identical to the original program from Singapore, but uses U.S. measurements and currency.

Primary Mathematics Standards Edition
Written to meet the California Public School standards prior to Common Core, this edition includes probability, data analysis, negative numbers, and coordinate graphing.

Primary Mathematics Common Core Edition
More closely aligns with Common Core. This edition has changes to the scope and sequence.

Please note that Primary Mathematics is not for sale to customers outside of the USA and Canada.