Nebraska Core Academic Content Standards
NE.MA.2.1. NUMBER: Students will communicate number sense concepts using multiple representations to reason, solve problems, and make connections within mathematics and across disciplines.
MA.2.1.2. Operations: Students will demonstrate the meaning of addition and subtraction with whole numbers and compute accurately.
MA.2.1.2.a. Fluently (i.e. automatic recall based on understanding) add and subtract within 20.
MA.2.1.2.b. Add and subtract within 100 using strategies based on place value, including the standard algorithm, properties of operations, and/or the relationship between addition and subtraction.
MA.2.1.2.c. Mentally add or subtract 10 or 100 to/from a given number 100-900.
MA.2.1.2.e. Add and subtract within 1000, using concrete models, drawings, and strategies, which reflect understanding of place value and properties of operations.