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Trade-First Subtraction

Trade-First Subtraction

by Esa Helttula

1 ratings
2 reviews
📚 Education

Archived App (Last seen on 13 May 2026)

This is an archived listing of the app previously available on the App Store.

Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.

Details

  • Released
  • Updated
  • January 26, 2010
  • October 3, 2021

Features

Developer

Esa Helttula
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iphone
ipad
⭐2
Reviews↘︎
❓8 answered
FAQ↘︎
📦w/o updates
Updates frequency↘︎
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About

This educational app teaches and reinforces the trade-first subtraction method with interactive, step-by-step animations. Users can practice with customizable numbers and settings, receiving immediate feedback on their work. It's designed to be an intuitive tool for mastering subtraction strategies.

✓Interactive trade-first subtraction method
✓Customizable number of digits (2-5)
✓Random and custom problem generation
✓Step-by-step animated borrowing
✓Customizable interface colors and animations
✓Immediate feedback on answers
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What's New in Trade

6.5

October 3, 2021

- support for iOS 15

User reviews

Most RecentHighest RatedLowest Rated

Excellent

This teaching tool for column subtraction is excellent. It is just the way I was taught, and I am confident my daughter (aged nine) will find it helpful. I previously reviewed another subtraction method by this developer called 'Column Subtraction'. I much prefer this new one. I am glad the developer seems to have taken on board my comments, and has released this one. Thanks
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AN0rtAN0rt

Wonderful.

This app has helped my 8 year old son immensely. He used to get confused with the borrowing and the problems he made up top would prevent him from getting the right answer. This app helped by focusing on one thing at a time. I love that I can create custom problems for him.
SinghsongsSinghsongs

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FAQ

What is the trade-first subtraction method taught in Trade-First Subtraction?

The trade-first subtraction method involves completing all 'trading' or 'borrowing' steps first, followed by the subtraction calculations for each column. This method is highlighted in curricula like Everyday Mathematics.

How does Trade-First Subtraction help students learn?

The app provides an intuitive interface with step-by-step animated borrowing, allowing students to visualize the process. It offers immediate feedback, reinforcing correct methods and motivating students through adjustable difficulty levels.

Can I customize the problems in Trade-First Subtraction?

Yes, you can generate random subtraction problems or create custom ones. The number of digits in each number can be set from 2 to 5, allowing for tailored practice sessions.

What devices is Trade-First Subtraction available on?

Trade-First Subtraction is available for iPhone, iPad, and iPod. It is designed to work across these Apple devices.

How often is Trade-First Subtraction updated?

The latest version of Trade-First Subtraction is 6.5, which was last updated on October 3, 2021. While updates are not extremely frequent, the app is stable and well-supported.

What is the user sentiment for Trade-First Subtraction?

The app has received a perfect rating of 5.0 stars from 1 rating, indicating very positive user sentiment. Teachers have also endorsed its effectiveness for reinforcing computation strategies.

Does Trade-First Subtraction have ads?

No, Trade-First Subtraction is ad-free. It also does not contain in-app purchases or links to external websites, ensuring an uninterrupted learning experience.

What is the price of Trade-First Subtraction?

Trade-First Subtraction is a paid app priced at $3.99. This one-time purchase provides access to all features without any additional costs or subscriptions.