### Preview lessons, content and tests

#### Computer Science & Programming solved. All in one platform.

1. To trial the platform and take tests, please take a few seconds to SIGN UP and SET UP FREE.

2. Searching for something specific? See our text overview of all tests. Scroll right for levels, and lists.

3. Student and Teacher User Guides |  Schemes of Work |   Real Teacher use Videos |

Join 36000+ teachers and students using TTIO.

### Decimal to Binary

Decimal is the number system we are used to working with and is base 10, with 10 digits from 0 to 9. Binary is a base 2 number system with just two digits - 0 and 1.

Take the number 11 (Decimal). How do we convert it into Binary?

Step 1:

Write out the following grid of numbers. Note that it starts (from the right hand side, with 1, and then each number is doubled)

 128 64 32 16 8 4 2 1

Step 2:

Consider which numbers in the grid would add up to 11. In this case 8 + 2 + 1. Put a 1 under each of those numbers and a zero in every other cell.

 128 64 32 16 8 4 2 1 0 0 0 0 1 0 1 1

Step 3:

Copy out the binary sequence. The below binary sequence is 11

 0 0 0 0 1 0 1 1

www.teachyourselfpython.com