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1st Grade Math - Numbers and Operations in Base Ten 1) Counting sequence (1.NBT.1) 2)Place value (1.NBT.2, 1.NBT.2.a, 1.NBT.2.b, 1.NBT.2.c, 1.NBT.3) 3)Place value understanding and properties of operations to add and subtract (1.NBT.4, 1.NBT.5, 1.NBT.6)

National Geographic is a reputable and world-renowned organization with an extremely experienced and knowledgeable staff of explorers and writers. National Geographic has been around for many years. There is a degree of seeking profits for the organization; however, National Geographic provides an extremely significant amount of data and information in science, even Earth Science.