Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

Know Abacus Screenshots

iPad

iPhone

About Know Abacus

Abacus is a wonderful mathematical instrument used for calculation. This app will help your children learn about Abacus, Numbers, Counting, Addition, and Subtraction. This is the first step to tap the unexploited potential in their brain and unleash their mathematical capability.

Suitable for children age 5 and up, who know about numbers and some basic addition and subtraction. For smaller children, recommend KnowNumber app.

* Counting with Abacus
* Addition/Subtraction 1 digit
* Addition/Subtraction 2 digits
* Multiplication 1-2 digits
* Division 1-2 digits
* Mental math
* Review lessons
* Unlimited random lessons
* Black/white or colorful abacus
* Learning modes
* Two-touch or multi-touch abacus
* Left-handed mode

Localized Languages:
* English, French, Spanish, Thai, Turkey, Arabic, Portuguese, and Russian

What's New in the Latest Version 2.0

Last updated on Jul 10, 2023

Old Versions

-UI Improvement
-Bug fixes

Version History

2.0

Jul 10, 2023

-UI Improvement
-Bug fixes

1.20

Apr 3, 2019

Minor bugs fixes.

1.19

Jul 6, 2018

Added Russian and Portuguese languages

1.18

Oct 8, 2017

-Minor bug fixes.

1.17

Aug 30, 2017

-Update arabic languages.
-Minor bug fixes.
-Fix crashes on some devices.

1.16

Jan 5, 2017

- Left-handed mode
- Turn on or off formula tables
- Minor bug fixes

1.15

Aug 15, 2015

Add Multi-touch abacus (changed in setting)

1.14

Jul 31, 2015

- 64-bit native support
- Stability improvement

1.13

Dec 11, 2014

Stability improvement.
Fix review link.

1.12

Oct 25, 2014

- New Language: Arabic
- 2 digit multiplication + tutorial
- 2 digit division + tutorial
- 3 learning modes: (1) step by step, (2) final answer, (3) formal exam

1.11

Oct 11, 2014

2 digit multiplication + tutorial
2 digit division + tutorial
3 learning modes: (1) step by step, (2) final answer, (3) formal exam

1.10

Jun 13, 2014

-Add new colorful abacus
-Get real rewards for just learning how to use Abacus.
-Fix bugs

1.9

May 30, 2014

Fix missing lessons.

1.8

May 6, 2014

-Improve visual
-Reset Scores in Setting menu
-New combined random lessons