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Trade First Subtraction

Author: Kristy Ardinger

How to do the Trade-First Algorithm

This is an example of how to do the Trade-First Algorithm that I use in the classroom with my students.

What is Trade-First Subtraction and How do I use it?

Follow this link published by the University of Chicago explaining how to complete the Trade-First subtraction algorithm.

http://everydaymath.uchicago.edu/educators/computation/sub_trade_first.shtml

Or - try this link, also by the University of Chicago.

Free Family Resources from Everyday Math

1. Click on the link below
2. Click on the Free Resources link in the bottom right corner
3. Click on Algorithms in Everyday Mathematics
4. Click 2
5. Click Subtraction
6. Click Trade-First Subtraction (focus)

http://emccss.everydaymathonline.com/g_login.html

Source: http://everydaymath.uchicago.edu/educators/computation/sub_trade_first.shtml

Trade-First Subtraction Practice

This is a page you can use at home to practice the Trade-First Subtraction method.

More Trade-First Subtraction Practice Ideas

Here is a website that allows you to move the base ten blocks between columns to visualize what it means to trade-first.

http://nlvm.usu.edu/en/nav/frames_asid_155_g_2_t_1.html?from=category_g_2_t_1.html

Trade-First subtraction App for your iPhone, iPad Touch, or iPad

http://itunes.apple.com/us/app/trade-first-subtraction/id351022585?mt=8

Ghost Bust Subtraction Practice

http://www.oswego.org/ocsd-web/games/Ghostblasters3/ghostsub3.html