## Reflection: Developing a Conceptual Understanding Finding the Unknown: Solving Problems with Unknown Change - Section 5: Continued Practice

As students were turning in their papers (for this activity) I noticed 5 of my 6 "High Flyers" all made the same mistake.  In the subtraction section, the students missed the two problems where the unknown was the first number.  Each student made the mistake of taking the second number and subtracting the answer to get the missing number.  Although their math works (how they solved it), it is a misunderstanding that I will address with the class as a whole.  There is a copy of the mistake int he section resource.

Developing a Conceptual Understanding: Common Error

# Finding the Unknown: Solving Problems with Unknown Change

Unit 11: The Number 10 and the Addition and Subtraction Concept
Lesson 8 of 17

## Objective: SWBAT use strategies to solve story problems with unknown change or starting number. SWBAT use numbers and standard notation to record answers.

### Thomas Young

203 Lessons14 new

## Big Idea: Students will dive into problems that require them to solve story problems with unknown changes. The idea will be explored as a class and then applied in individual tasks.

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Standards:
Subject(s):
Math, 1st Grade, story problems, finding the unknown, representing with equations
75 minutes

### Thomas Young

203 Lessons | 14 new

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