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Addition with Unknown Numbers

1st Grade • Half Day Lesson Plan
$4
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Lesson Plan Description

This half day lesson plan is broken down into 2 separate segments (60 minutes each) addressing Operations and Algebraic Thinking: Addition with Unknown Numbers (1.OA.8). These lessons include: key addition vocabulary, guided and independent practice of concepts, and 3 activities  to reinforce the concept of determining an unknown in an addition equation.

  • Segment 1: students will determine the unknown number in an addition equation relating 3 numbers using
    manipulatives, count on to determine the unknown number to make an addition equation true, and use subtraction to determine the unknown number to make an addition equation true.
  • Segment 2: students will participate in 3 activities, “How Many are Hiding?,” “How Many Sprinkles,” and “Missing Numbers – Around the Room.”

These lessons can be taught over the span of a half day or you can use the lessons independently, broken up over several days.