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)