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# Math in Focus - 3A Lesson 12.1 (including Recall Prior Knowledge)

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Author: CHRIS BRENNAN
##### Objective:

This tutorial covers Math in Focus Lesson 12.1 (Real-World Problems: One-Step Problems). I begin by "recalling prior knowledge" about bar models and then move on to using bar models and addition, subtraction, multiplication, and division to solve real-world problems.

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## Video 4: Lesson 12.1 Guided Practice 1

This video will show you how to use addition and a part/part/whole bar model to find the answer.

## Video 5: Lesson 12.1 Guided Practice 2

In this problem, I use addition and a part/part/whole bar model to find the answer.

## Video 6: Lesson 12.1 Guided Practice 3

In this video, I use addition and a part/part/whole bar model to find an answer, and then convert the answer from grams to kilograms. Remember: 1000 grams = 1 kilogram!

## Video 7: Lesson 12.1 Guided Practice 4

In this video we use addition to find the answer, and then convert meters into kilometers. Remember, 1 kilometer = 1,000 meters!

## Video 8: Lesson 12.1 Guided Practice 5

Are we adding in this video? No! This problem calls for a comparison bar model instead of a part/part/whole bar model to find the answer.

## Video 9: Lesson 12.1 Guided Practice 6

In this video, I use multiplication and a bar model to find the answer to two different problems.

## Lesson 12.1 Guided Practice 7

To conclude Lesson 12.1, I use division and a bar model to find the answer.

Jeremy — over 2 years ago

I'm a fourth grade teacher. I just wondered what software you used to make your videos?

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CHRIS BRENNAN answered over 2 years ago

Hi Jeremy,

Nothing complicated- I use Smart Notebook to model the problems (with the SmartBoard) and Quicktime to record. If you go to Quicktime Player/File/New Screen Recording, you can capture everything on the SmartBoard. I use a set of USB headphones with a built-in microphone to record the narration as I'm solving the problems. You could also drag the video into iMovie to edit, but I'm not fluent in that program!

Hope that helps!

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