Texas Essential Knowledge and Skills (TEKS)
TX.111.3. Grade 1, Adopted 2012
1.3. Number and operations. The student applies mathematical process standards to develop and use strategies for whole number addition and subtraction computations in order to solve problems. The student is expected to:
1.3 (D) Apply basic fact strategies to add and subtract within 20, including making 10 and decomposing a number leading to a 10.
1.3 (E) Explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences.
1.5. Algebraic reasoning. The student applies mathematical process standards to identify and apply number patterns within properties of numbers and operations in order to describe relationships. The student is expected to:
1.5 (G) Apply properties of operations to add and subtract two or three numbers.