Lesson+7

media type="file" key="SubtractionMissionLesson7.mp3" width="240" height="20" (Click here to listen to the text of the lesson.)
 * Lesson 7: Agent X, are you ready for the ultimate challenge? **

Congratulations, Agent X! You have completed six important tasks of this mission and earned six stars. To earn your last star, which would qualify you as a special agent for subtraction missions, you have to master the ultimate challenge: the post-assessment. However, a Common Crafts video and a guided reflective summary will help you to review all prior stages and learning. Complete this first, before tackling the ultimate challenge. Good luck!



** Guided reflective summary ** :

Step 1: ** Recognizing subtraction. ** Write in your Mission Notebook in your own words what you learned and whether you feel confident or not.

Step 2: ** Preparing the algorithm for subtraction by stacking and vertically aligning. ** Write in your Mission Notebook in your own words what you learned and whether you feel confident or not.

Step 3: ** Deciding which path to take – Trade-First Method or simple method. ** Write in your Mission Notebook in your own words what you learned and whether you feel confident or not.

Step 4: ** Applying the Trade-First Method. ** Write in your Mission Notebook in your own words what you learned and whether you feel confident or not.

Step 5: ** Subtracting the digits. ** Write in your Mission Notebook in your own words what you learned and whether you feel confident or not.

Step 6: ** Checking and verifying the result. ** Write in your Mission Notebook in your own words what you learned and whether you feel confident or not.

Now take a look at the following video about the subtraction of two-digit numbers:

media type="youtube" key="CKT655IA5jE" height="349" width="560"

Are you ready for the ultimate challenge? If not, watch the video a second time or go back to the notes and exercises in your Mission Notebook.



** Post-assessment ** – **the ultimate challenge!**

Whenever you feel ready, download the post-assessment document. Open it and complete it. Save it on the desktop of your computer as “Postassessment(your name)”. Then forward it by email to the Mission Leader (aka your teacher).



Mission Control also needs to see your Mission Notebook. Hand it over to your teacher.

You will be informed shortly whether you have received “Special Agent” status or whether you will need some more training. No matter the outcome, I am already saying:

** ﻿ CONGRATULATIONS SPECIAL AGENT X!!! **

If you enjoy using your new skills or would like to get some more practice, go to the Resource page.