Students write all four related equations for fact family triangles where all sums fall between 10 and 20. This targeted range focuses on the facts that students typically find most challenging.
Use as targeted practice for 2nd graders working toward fluency within 20. The 10-to-20 range eliminates easier facts, making every problem a meaningful challenge. Great for timed fluency drills.
These are the "hard" basic facts. Practice a few problems each day rather than doing the whole sheet at once. Celebrate progress - mastering these facts is a major milestone!
This worksheet supports the following Common Core State Standards for Mathematics:
Write all four related facts for each fact family with sums between 10 and 20. Targets the higher end of basic addition and subtraction fact fluency.
