In teams, students work together to convert five binary numbers into decimal numbers. When complete, the group shouts ‘stop’ and receives a time.
Students swap responses with another group and correct answers. You could complete a short reflection here and ask how successfully the teams collaborated. Did everyone participate equally? Did they devise a strategy to complete this challenge?
Alternatively use these online binary cards for a binary number of 8 digits (byte) provided by CS unplugged. As a starting point you may want to use 5 online binary cards which make it easier to introduce the concept.
Do you understand what a binary number is?
Do you understand why binary numbers are important in digital systems?
Can you read and understand a binary number?
Can you convert a binary (base 2) number to a decimal (base 10) number?