Version history
Trade-First Subtraction
40
ASO score
Text
31/100
Reviews
50/100
Graphic
60/100
Other
0/100
App Rating
4.7
Votes
3
App Age
15y 11m
Last Update
Oct 03, 2021
Compare with Category Top Apps
|
Metrics
|
Current App
|
Category Top Average
|
Difference
|
|---|---|---|---|
|
Rating
|
4.67
|
4.59
|
+2%
|
|
Number of Ratings (Voted)
|
3
|
1M
|
-100%
|
|
App Age
|
15y 10m
|
7y 11m
|
+100%
|
|
Price
|
$4
|
$1
|
+698%
|
|
In-app Purchases Price
|
$0
|
$53
|
|
|
Update Frequency
|
1533d
|
19d
|
+7 770%
|
|
Title Length
|
23
|
27
|
-15%
|
|
Subtitle Length
|
0
|
28
|
|
|
Description Length
|
2 832
|
3 025
|
-6%
|
|
Number of Screenshots
|
590
|
1298
|
-55
%
|
|
Size
|
0MB
|
239MB
|
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Category Ranking in United States
7 days
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Last year
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| Top | Dec 06, 2025 | Dec 13, 2025 |
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Ranking Keywords in United States
| Keywords | App Rank |
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Analyze this and other apps using Asolytics tools
Text ASO
Title
(
Characters:
23
of 30
)
Trade-First Subtraction
Subtitle
(
Characters:
0
of 30
)
Description
(
Characters:
2832
of 4000
)
This app can be used to teach and study the trade-first subtraction method. The app is easy to use and it has an intuitive interactive interface with customizable colors and other settings. The user can solve random subtraction problems with small and large numbers. The number of digits in the numbers can be set.
Endorsed by Teachers
Rita Zeni, Ecole Sandy Hill Elementary, Abbotsford, BC, Canada:
"The math apps by Esa Helttula allow students to practice and reinforce the specific computation strategies taught in class, with as much or as little scaffolding as necessary.
They also provide individualized feedback to each student, with an immediacy that is not always possible through pencil and paper practice. Being able to adjust the level of difficulty to suit their needs is also very motivating for the students. I am so glad to have come across this great educational tool!"
The Trade-First Method
The trade-first subtraction method is similar to the traditional column subtraction method. The method has two stages. All of the "trading" or "borrowing" is done first. Then the subtractions are solved. This gives the method it's name, "trade-first."
In the Everyday Mathematics curriculum the trade-first method is the focus algorithm for subtraction.
The App is Easy to Use
The numbers are aligned automatically so that you can concentrate on solving the operations for each column.
Borrowing is animated step by step so you can see what happens. Borrowing over several columns is also supported.
After you solve the operation for each column the correct answer will fly to the right place. If the user presses the wrong button the answer will appear above the keyboard but it will not move.
Features:
- Each number can have from 2 to 5 digits
- Problems can be custom or random
- The current operation for each column can be hidden
- The operands of the current operation can be highlighted
- Colors of the interface can be changed
- The speed of the animations can be set
- The lines separating the columns can be hidden
Other iDevBooks math apps
iDevBooks math apps have been reviewed and endorsed by Wired.com, IEAR.org, Edudemic.com, Teachers with Apps, and other respected sites and organizations.
Some of the other 40 iDevBooks math apps are Column Addition, Long Multiplication, Long Division, Column Subtraction, Visual Multiplication Table, Partial Differences Subtraction, Partial Products Multiplication, Partial Sums Addition, Decimal Rounding, etc.
Feedback and requests for new features
New ideas to make this app better are welcome. Please visit idevbooks.com to give feedback.
Privacy
This app has no ads or in-app purchases and it does not transmit any data during the operation of the app. This app also does not contain any links to other apps or the web.}
Read more
Other
Additional Information
| Rating: | |
| Voted: | 3 |
| App Store Link: | |
| Price: | 3.99 $ |
| Website: | |
| Email: | - |
| Privacy Policy: | |
| Categories: | Education |
| Size: | - |
| App Age: | 15 years 11 months |
| Release Date: | Jan 26, 2010 |
| Last Update: | Oct 03, 2021 |
| Version: | 6.5 |
Version history
6.5
Oct 03, 2021
- support for iOS 15
6.0
Oct 03, 2019
- support for iOS 13
- new interface with support for latest iPad and iPhone models
- new theme colors
