Addition Equations Day 2


Created by:

Mike Webb




Teaching Point: I can find unknowns in addition equations by using number bonds. *Use the number line 1.OA.8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. Unpacking - First graders use their understanding of and strategies related to addition and subtraction in 1OA4 and 1OA6 to solve equations with an unknown. Rather than symbols, the unknown symbols are boxes or pictures. *Let’s use boxes for unknowns as this prepares them for 2nd grade and up. *count on using number lines, cubes, ten frames, and/or drawing circles
Common Core Standards


Problem Set: Application Problem: April has 10 board games. She bought 6 more at a yard sale. How many board games does she have now? 10 + 6 = Thomas is collecting boxes to build a fort. He has 8 boxes. His mom said he need 13 boxes to make the fort. How many more boxes does he need to collect? 8 + = 13
I do: Show students the problem 4 + ___ = 9 Remind them how we solved this type of problem yesterday using the number bond and counting-up with cubes. Today, they will continue to solve these types of missing addend problems, but with the number line. Solve the example problem by finding 4 on the number line and counting-up to 9. How many hops did you make on the number line? This is the missing addend. Now we know that 4+5=9 b/c we made 5 hops to get to 9.
1. Read the equation. 2. Fill in the knowns 3. Find the unknown
Task: Unknown Number Flip Cards (there are addition and subtraction, but today you will only use the addition cards)


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November 01, 2016 at 05:03 PM
Test day 2