The question shows which standards it's supposed to adhere to: (CC.2.OA.1, CC.2.NBT.5). Let's look that up, shall we?

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CCSS.Math.Content.2.OA.A.1
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

http://www.corestandards.org/Math/Conten...
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CCSS.Math.Content.2.NBT.B.5
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

http://www.corestandards.org/Math/Conten...
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If you ask me, the standards actually seem fine. It's the curriculum that's messed up. What school district are these worksheets coming from?