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Standards/Math/Alabama/1.1.c

1.1.c

1.1 Use addition and subtraction to solve word problems within 20 by using concrete objects, drawings, and equations with a symbol for the unknown number to represent the problem.
1.1.a
1.1.b
1.1.c
1.1.d

Put together/take apart with addend unknown to solve word problems within 20.

Khan Academy Resources
Add and subtract within 20 word problemsAdding up to four 2-digit numbersAddition and subtraction word problems: superheroesAddition and subtraction word problems: gorillas
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