1. 01011001 01100101 01100001 01110010 00100000 00111000 00100000 01000010 01101001 01101110 01100001 01110010 01111001

2. LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal

3. Starter LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal Discuss – What is binary? Page 1 of your workbook

4. Still confused. Computers are not human. They run on electricity, that means they have to use electricity to represent information. Electricity has two states ON or OFF. LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal

5. Electric Switch Think of a light switch. It is either ON or OFF – ON = light on – OFF = light off On a computer the computer Saves the information as a single number. 1 = There is power 0 = There is no power LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal Page 1 of your workbook

6. bit of this bit of that!!! Computers save lots and lots of these 1 (ON) and 0 (OFF) numbers. We have to group them: one ON and OFF together are called a ‘bit’. This stands for binary digit Refresh. A bit is made up of a 1 and an 0

7. Grouping If we have one bit we can have two values. 1 or 0 How many values can we have if we join two bits together. – 00 – 01 – 10 – 11 You can see that if we put two bits together we can pick 4 different values. We can keep grouping bits to make more and more values LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal

8. Page 2 of your workbook How many different values can be made with 3 bits? extension.: 1 bit = 2 1 2 bit = 2 2 2 bit = 2 3 2 bit = 2 4 How many values can you have with 5 bits. 000 001 010 011 100 101 110 111 Extension: 2 5 = 32 values

9. Grouping further! The smallest unit in binary is the bit. Four bits together are called one nibble. Eight bits are called one byte. 1024 bytes are called one kilobyte (kb) And there is more…….. LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal

10. Binary to decimal In decimal if we have the number 7 we can lay it out in a table: Each is a power of 10 In binary we have a different table. Each is a power of 2. LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal 1000100s10’sunits 7 1286432168421 00000111 Note: the is 8 bits which is a Byte

11. Another Example The number 127 In binary The number 255 In binary LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal 1000100s10’sunits 127 1286432168421 01111111 1000100s10’sunits 255 128643216842 1 11111111

12. Pupils to pretend to be a Byte Pupils to be given the signs. Competition to see who can make the binary number first. Teacher will say a number between 1-255 LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert decimal to binary and binary to decimal

13. Binary to decimal In binary Changing binary to decimal. 0*128 + 0*64 + 0*32 + 0*16 + 0*8 + 1*4 + 1*2 + 1*1 = 7 LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert binary to decimal 1286432168421 00000111 1286432168421 01100001 Changing binary to decimal. 0*128 + 1*64 + 1*32 + 0*16 + 0*8 + 0*4 + 0*2 + 1*1 = 97

14. Activity. Binary worksheet. Work your way through the worksheet. Don’t be afraid to ask the person next to you. LO1. To learn the purpose of binary LO2. To recognise binary bits. LO3. To convert binary to decimal

15. Plenary Using your knowledge of binary. What does this mean. Pupils to explain what they think it means