iPad Screenshots


This app is about visualizing ten’s complements and extending that knowledge to master addition with sums up to 20.

About ten's complements:
The "ten's complement" is the number that you must add  to get 10.  For example, the ten's complement of 6 is 4.  And the ten's complement of 3 is 7.

Having a clear visual image of single-digit numbers and their ten's complements is known to be very helpful in doing addition and subtraction. It is also a key step in facilitating mental math.

About us:
Digi-Block provides a method for learning about numbers and operations – addition, subtraction, multiplication, and division. There is a progression of steps. Each step is easy to grasp visually. The magic of math is that after mastering a relatively small number of steps, the learner is able to solve difficult problems! Check out digi-block.com to see what else we have to offer.

What’s New

Version 1.0.0

This app has been updated by Apple to display the Apple Watch app icon.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

App Privacy

The developer, Digi-Block, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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