Texas Essential Knowledge and Skills Teaching Resources

Math 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) use concrete and pictorial models to determine the sum of a multiple of 10 and a one-digit number in problems up to 99;
    • (A) use objects and pictorial models to solve word problems involving joining, separating, and comparing sets within 20 and unknowns as any one of the terms in the problem such as 2 + 4 = [ ]; 3 + [ ] = 7; and 5 = [ ] - 3;
    • (B) compose 10 with two or more addends with and without concrete objects;
    • (C) apply basic fact strategies to add and subtract within 20, including making 10 and decomposing a number leading to a 10;
    • (D) explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences; and
    • (E) generate and solve problem situations when given a number sentence involving addition or subtraction of numbers within 20.

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