# The binary code for key is

Discussion may start at the 26 letters of the English alphabet, and then expand to other characters on the keyboard, including capital letters, digits and punctuation. Students may be aware that other languages can have thousands of characters, and the range of characters is also expanding as emoticons are invented! There is also an online interactive version of the binary cards herefrom the Computer Science Field Guidebut the binary code for key is is preferable to work with physical cards.

How can we represent the letters using numbers? Guide students to the idea of using 1 for A, 2 for B, and so on. We can represent numbers using binary, but in the last lesson with 4 bits, what was the biggest number we could represent? Give out the cards, and have the students place them on the table in the correct order 16, 8, 4, 2, 1. Ask them how many dots this produces. The the binary code for key is is for the 8 card, so it's the number 8.

Which letter is number 8? This can be written on the binary code for key is board. Which letter is number 9? Now try sending a different word to the class. In particular, it may be helpful to represent a number higher than 16 to give them experience with the 5th bit. Note that if your the binary code for key is alphabet is slightly different e. A is the 1st letter. We can reuse that! Computer Scientists always look for ways to reuse any work they have done before.

To reinforce students' alphabet knowledge, you could translate all student's name into binary numbers onto a piece of card and display it around the room.

Some languages have more or fewer characters, which might include those with diacritic marks such as macrons and accents. If students ask about an alphabet the binary code for key is more than 32 characters, then 5 bits won't be sufficient. Also, students may have realised that a code is needed for a space 0 is a good choice for thatso 5 bits only covers 31 alphabet characters. A typical English language keyboard has about characters which includes capital and lowercase letters, punctuation, digits, and special symbols.

How many bits are needed to give a unique number to every character on the keyboard? Now have students consider larger alphabets. How many bits are needed if you want a number for each of 50, Chinese characters? It may be a surprise that only 16 bits is needed for tens of thousands of characters.

This is because each bit doubles the range, so you don't need to add many bits to cover a large alphabet. This is an important property of binary representation that students should become familiar with. The rapid increase in the number of different values that can be represented as bits are added is exponential growth i. After doubling 16 times we can represent 65, different values, and 20 bits can represent over a million different values. Exponential growth is sometimes illustrated with folding paper in half, and half again.

After these two folds, it is 4 sheets thick, and one more fold is 8 sheets thick. In fact, around 6 or 7 folds is already impossibly thick, even with a large sheet of paper.

The binary code for key is the lessons there are links to computational thinking. Below we've the binary code for key is some general links that apply to this content. Teaching computational thinking through CSUnplugged activities supports students to learn how to describe a problem, identify what are the important details they need to solve this problem, and break it down into small, logical the binary code for key is so that they can then create a process which solves the problem, and then evaluate this process.

These skills are transferable to any other curriculum area, but are particularly relevant to developing digital systems and solving problems using the capabilities of computers. For more background information on what our definition of Computational Thinking see our notes about computational thinking. We used multiple algorithms in this lesson: These are algorithms because they are a step-by-step process that will always give the right solution for any input you give it as long as the process is followed exactly.

Choose a letter to convert into a decimal number. A the binary code for key is efficient algorithm would have a table to look up, like the one created at the start of the activity, and most programming languages can convert directly from characters to numbers, with the notable exception of Scratch, which needs to use the above algorithm. The next algorithm takes the algorithm from lesson 1 which we use to represent a decimal number as a binary number:.

Can students create instructions for, or demonstrate, converting a letter into a decimal number, and then convert a decimal number into binary; are they able to show a systematic solution?

This activity is particularly relevant to abstraction, since we are representing written text with a simple number, and the number can be the binary code for key is using binary digits, which, as we know from lesson 1, are an the binary code for key is of the physical electronics and circuits inside a computer.

We could use any two values, for example you could represent your message by flashing a torch on and off, or drawing a line of squares and triangles on the whiteboard. Binary number representation is an abstraction that hides the complexity of the electronics and hardware inside a computer that stores data.

Have students create instructions for, or demonstrate how to represent new language elements, such as a comma. Recognising patterns in the way the binary number system works helps give us a deeper understanding of the concepts involved, and assists us in generalising these concepts and patterns so that we can apply them to other problems.

Have students decode a binary message from another student, by converting the binary numbers into text to view the message. The binary code for key is they recognise patterns in the binary to anticipate what the binary code for key is word is?

Can they work with a different set of letters using the same principles? Logical thinking means recognising what logic you are using to work these things out. If you memorise how to represent that the letter H is represented as binary it's not as generally applicable as learning the logic that any character can be represented by the process described in this activity.

Observe the systems students have created to translate their letters into binary and vice versa. What logic has been applied to these? Are they efficient systems? An example of decomposition is breaking a long message such as into 5-bit componentseach of which can now be converted to a letter. The 5-bit components are then decomposed into the value of individual bits. An example of evaluation is working out how many different characters can be represented by a given number of bits e.

Can a student work out how many bits are needed to represent the characters in a language with 50 characters? Home Topics Binary numbers Binary numbers Codes for letters using binary representation Codes for letters using binary representation Duration: Printables Binary Cards One set for class demonstration. Binary Cards Small One set of cards per student. Binary to Alphabet Blank sheets for students, plus teacher answer sheet.

Table of contents Codes for letters using binary representation Key questions Lesson starter Lesson activities Computational Thinking. Learning outcomes Students will be able to: Count on from the highest number to find the total number of dots on the binary cards. Numeracy Match letters in the alphabet to the numbers representing them. Reading Recognise that the alphabet is in an order and so are numbers. The next algorithm takes the algorithm from lesson 1 which we use the binary code for key is represent a decimal number as a binary number: Find out the number of dots that is to be displayed.

We'll refer to this as the "number of dots remaining", which initially is the total number to be displayed. For each card, from the left to the right i. If the number of dots on the card is more than the number of dots remaining: Hide the card Otherwise: Show the card Subtract the number of dots on the card from the number of dots remaining Examples of what you could look for: Examples of what you could look for: Can students convert a coded message with no spacing in it?

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