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Version
6.0
Size
1.08 Mb
Updated
5 years ago
Released
09 Jun 2010
Screenshots
Description
In the Opposite-Change Addition app the user can keep adding a number to one addend and subtract the same number from the other addend until the addition problem can be solved easily.
The opposite-change rules states that if you subtract a number from one addend and add the same number to the other addend, the sum remains the same. An addition problem 267 + 289 is easier to solve when it has been changed into 256 + 300.
Features:
- The numbers can have up to 3 digits
- You can set your own problems
- Three different themes
- Native interfaces for iPhone, and iPad
Other iDevBooks math apps
iDevBooks math apps have been reviewed and endorsed by Wired.com, Common Sense Media, and other respected sites and organizations.
Some of the over 40 other iDevBooks math apps are Visual Multiplication Table, Decimal Rounding, Whole Number Rounding, Column Subtraction, Column Addition, Long Division, Long Multiplication, Lattice Multiplication, Fraction Math, Partial Differences Subtraction, Partial Quotients Division, Partial Sums Addition, 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.
Estimates
Availability
Devices
iPhoneFirstGen
iPodTouchFirstGen
iPodTouchSecondGen
iPhone3G
iPhone3GS
iPadWifi
iPad3G
iPhone4
iPodTouchThirdGen
iPodTouchFourthGen
iPad2Wifi
iPad23G
iPhone4S
iPadThirdGen
iPadThirdGen4G
iPhone5
iPodTouchFifthGen
iPadFourthGen
iPadFourthGen4G
iPadMini
iPadMini4G
iPhone5c
iPhone5s
iPadAir
iPadAirCellular
iPadMiniRetina
iPadMiniRetinaCellular
iPhone6
iPhone6Plus
iPadAir2
iPadAir2Cellular
iPadMini3
iPadMini3Cellular
iPodTouchSixthGen
iPhone6s
iPhone6sPlus
iPadMini4
iPadMini4Cellular
iPadPro
iPadProCellular
iPadPro97
iPadPro97Cellular
iPhoneSE
iPhone7
iPhone7Plus
iPad611
iPad612
iPad71
iPad72
iPad73
iPad74
iPhone8
iPhone8Plus
iPhoneX
Pricing by country
| Country | Price |
|---|---|
| Canada | 5.49 CAD |
| China | 25 CNY |
| France | 4.49 EUR |
| Germany | 4.49 EUR |
| Italy | 4.49 EUR |
| Netherlands | 4.49 EUR |
| Portugal | 4.49 EUR |
| Spain | 4.49 EUR |
| Poland | 4.49 EUR |
| UK | 3.99 GBP |
| India | 299 INR |
| Japan | 490 JPY |
| Korea, Republic Of | 999.99 KRW |
| Poland | 18.99 PLN |
| Russia | 299 RUB |
| Turkey | 26.99 TRY |
| USA | 3.99 USD |
| Korea, Republic Of | 4.39 USD |
| Ukraine | 3.99 USD |
