Finding the Unknown in Addition Equations

Word Problems With Unknowns in Any Position

Updated 1 month ago · 5 views

Determine the missing whole number in an addition equation within 20, whether the unknown is the first addend, second addend, or sum.

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Word Problems With Unknowns in Any Position

1st Grade · Math · TEKS

7 lessons

Goal

Represent and solve addition and subtraction word problems within 20 where any number may be unknown.

7 lessons

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Learning standards covered

111.3(b)(5)(F)Texas Essential Knowledge and Skills (TEKS) · Math · 1st Grade

determine the unknown whole number in an addition or subtraction equation when the unknown may be any one of the three or four terms in the equation; and

Open Global Standard:OGM.2.OA.4

111.3(b)(1)(B)Texas Essential Knowledge and Skills (TEKS) · Math · 1st Grade

use a problem-solving model that incorporates analyzing given information, formulating a plan or strategy, determining a solution, justifying the solution, and evaluating the problem-solving process and the reasonableness of the solution;

Open Global Standard:OGM.2.MP.1

111.3(b)(1)(C)Texas Essential Knowledge and Skills (TEKS) · Math · 1st Grade

select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems;

Open Global Standard:OGM.2.MP.1

OGM.2.OA.4

OGM.2.MP.1