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TX.111.14. Mathematics, Grade 2.

(2.1) Number, operation, and quantitative reasoning. The student understands how place value is used to represent whole numbers. The student is expected to:

2.1 (A) Use concrete models of hundreds, tens, and ones to represent a given whole number (up to 999) in various ways.

(2.3) Number, operation, and quantitative reasoning. The student adds and subtracts whole numbers to solve problems. The student is expected to:

2.3 (A) Recall and apply basic addition and subtraction facts to 18.

(2.5) Patterns, relationships, and algebraic thinking. The student uses patterns in numbers and operations. The student is expected to:

2.5 (A) Find patterns in numbers such as in a 100s chart.

2.5 (C) Use patterns and relationships to develop strategies to remember basic addition and subtraction facts. Determine patterns in related addition and subtraction number sentences (including fact families) such as 8 + 9 = 17, 9 + 8 = 17, 17 - 8 = 9, and 17 - 9 = 8.