App profile · Education

Add Up to 21

by Yonggao Yang · $0.99 · Version 1.3

Availability No longer on the App Store

Add Up to 21 is made and published by Yonggao Yang. AppBrain is an independent app data site and isn't affiliated with Yonggao Yang. The app name, icon, screenshots and description belong to Yonggao Yang and are shown as published on the App Store.

About Add Up to 21

Add Up to 21 was an education app developed by Yonggao Yang. It was removed from the App Store Oct 14, 2024.

User Ratings

The app had no ratings.

App Information

Add Up to 21 cost $0.99. The app size was 21.56 MB. The last available version was 1.3. The last update was on September 28, 2021.

Technical Requirements

The app had a content rating of Everyone. The app had been available on the App Store since January 2017.

Description by Yonggao Yang (from the App Store)

Poker Blackjack is a popular game related to adding numbers to 21. This app adopts this idea to train your brain to add number fast without paper and pen.
You are challenged to do this as fast as you can within 3 minutes: pick cards from the 7 given number-cards so that the sum of them is 21. Each number-card is a poker card with a value in the range of 1 to 13.
The more you practice, the faster you will be able to pick the right numbers for the sum of 21. Doing this can truly sharpen your skills and performance to computing in brain without using pen and paper.
Your best performance is saved, along with the date and time you created it.
This app is for pre-school, 1st grade, 2nd grade students and senior citizens who want to keep their brain sharp.

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Price	$0.99
Rating	No ratings
Version	1.3
App size	21.6 MB
Suitable for	Everyone

This app is currently not available on the App Store.

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Changelog of Add Up to 21

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Developer information for Yonggao Yang

Yonggao Yang

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