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Subtraction and Unknown Addends (to 20)

Grade 1 Common Core Math Standard

Aligned To Common Core Standard:

Grade 1 Operations- OA.4

AnswersAnswer Keys



View Answer Keys- All the answer keys in one file.




Extra Resources



Guided Lessons

The pictures should help students along with these.




Practice Worksheets

The sheets below should start to stimulate thinking at the next level for students.

  • Addition Equations - See if you can get this one to add up for you.
  • Independent Practice - The diagrams used here are great to work into fractions in the next level of the core curriculum.
  • Independent Practice 2- The dark part is what is missing and students need to fill in.
  • Matching Worksheet - This is great to see the level that kids are thinking about. I like to just set them loose on these.