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Description
This virtual manipulative encourage the development of flexible arithmetic thinking. Watch a video of the app: http://www.youtube.com/watch?v=iN3b20F6UC8 A calculation triangle is splited into three fields. Each field can contain tokens. On each edge... Read More
This virtual manipulative encourage the development of flexible arithmetic thinking.
Watch a video of the app: http://www.youtube.com/watch?v=iN3b20F6UC8
A calculation triangle is splited into three fields. Each field can contain tokens. On each edge the sum of the two corresponding fields is written.
And this is how it works:
Touch with you fingers on a field to produce tokens and move them from one field to another.
Move tokens out of the triangle to delete them.
Close the shutter to hide a field.
If you swipe over a number you can hide it or show it again.
Shake the calculation triangle to emty it.
This virtual manipulative does not include tasks. But you can use this app to create puzzle problems for a learning partner or to model and solve existing tasks. Here are some exemples for good tasks to effectively work with this app:
Find the missing numbers?
Figure out how many tokens are on the hidden field?
How do the numbers change, if you ...
... add/remove one (two, three, ...) token to each field?
... move one (two, three, ...) token from one field to another?
... add one token to two of the three fields?
...
Is it possible to have three odd numbers? Why (not)?
Is there a relationship between the sum of the numbers and the total quanitiy of tokens on the fields?
Is it possible to produce any numbers or are there restrictions? Collapse
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Recent Price Changes
- $0.99 since Dec 09, '20
- Free for < 1 day Dec 09, '20
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- $0.99 for 231 days Apr 20, '20
- Free for 1 day Apr 18, '20
- $0.99 for 314 days Jun 10, '19
- Free for 71 days Mar 30, '19
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- Free for 1 day Dec 30, '17
- $0.99 for 287 days Mar 18, '17
- Free for < 1 day Mar 18, '17
- $0.99 for 32 days Feb 14, '17
- Free for < 1 day Feb 14, '17
- $0.99 for 455 days Nov 17, '15
- Free for < 1 day Nov 17, '15
- $0.99 for 1091 days Nov 20, '12
- Free before Nov 20, '12
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Disclaimer
All app prices are tracked in USD. This price was last verified in the US App Store 33 minutes ago and is subject to change. Prices marked with an asterisk (*) indicate that the app contains in-app purchases.