## Reflection: Connection to Prior Knowledge Modeling Mixed Number Addition & Subtraction - Section 2: "Play Time"

Normally, when working with fractions, I make concrete connections between the skills students have mastered already and the skills the skills that are necessary components of learning something new.

Today, I did not have time for this part of the lesson, because there were more technology gitches than I had planed for.

I would have drawn fraction building blocks for:

-common denominators

-common multiples

-equivalent fractions

- estimation

- regrouping

I had to cut this part of my lesson out for time, but since the handout included scaffolds to help with this, I wasn't worried.  Without the hand out, I would have had to make time, because with models on the computer, sometimes students forget to apply what they know (like finding common denominators) and hope the computer will do all the work for them.

Something I would have included
Connection to Prior Knowledge: Something I would have included

# Modeling Mixed Number Addition & Subtraction

Unit 3: Adding and Subtracting Mixed Numbers
Lesson 7 of 11

## Big Idea: Students use digital fraction models to represent the addition and subtraction of mixed numbers.

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Standards:
Subject(s):
Math, Computers, Number Sense and Operations, Fractions, mixed numbers, add and subtract fractions, Critical Area
60 minutes

### Julie Kelley

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