math curriculum guide grades 1 10 Gse second grade curriculum map unit 1 unit 2 unit 3 unit 4 unit 5 unit 6 unit 7 extending base ten understanding becoming fluent with addition and subtraction understanding measurement, length, and time applying base ten understanding understanding plane and solid figures developing multiplication show what we know mges2nbt1 mges2nbt2 mges2nbt3 mges2nbt4 mges2md10 mges2oa1.