Build an adding machine, one card at a time.
Flip binary cards, build half and full adders, then connect them into an 8-bit machine you can explore.
Start with the free card lesson. One purchase unlocks the rest of the addition course.
From cards to a calculator
Course map- 01Free
Binary cards
Flip cards to discover how binary represents numbers.
- 02Included in addition
Half adder
Build a machine that adds two one-bit inputs.
- 03Included in addition
Full adder
Add a third input so your machine can receive a carry.
- 04Included in addition
2-bit adder
Connect two machines and follow the carry between them.
- 05Included in addition
4-bit adder
Reuse the machines to build a four-bit adder.
- 06Included in addition
8-bit workshop
Build and explore an eight-bit adding machine.
- 07Included in addition
Calculator
Enter two numbers from 0 to 255, then open the case to see how the sum is made.
One course, one purchase
The card lesson is free. Purchase the addition course to unlock half and full adders, 2-bit, 4-bit and 8-bit machines, and the calculator.
See all lessonsAddition course
View course detailsFrequently asked questions
Do I need to know binary or coding?
The course begins with flipping and counting cards. You can start without knowing binary or writing code.
Where can I use the course?
Open Bit Kido in a browser on a computer, tablet or phone. Purchased course access follows your account; lesson progress is saved in the browser you use.
Which languages and audio are available?
You can switch between Chinese and English. Audio availability varies by lesson and language; some activities use captions only. Use the sound control to turn narration on or off.
How do payment and refunds work?
Pay once in US dollars through Creem. You can request a full refund within 7 calendar days of purchase. Email lcpmarvel@gmail.com from the address used for your purchase and include your order number or receipt reference. See the refund policy for details.