Track quiz
Here is the line to keep from each idea before you answer.
| Idea | The line to keep |
|---|---|
| Numbers on cards | In binary, each place is worth twice the place on its right. Add the places that have a 1. |
| Letters on cards | Four holes give 16 patterns. Five holes give 32. So 26 letters need five holes. |
| Sorting with a needle | Sort by the 1 hole first and the 16 hole last. Put the open-hole pile behind. |
| A lights puzzle | Each clue keeps only the settings that obey it. When one setting is left, that is the answer. |
A five-hole card reads 10100. What number is it?
What is the biggest number a five-hole card can show?
Binary places: how does each compare with the one on its right?
Which holes do you open to make 21?
Why do 26 letters need five holes?
In our code, A is 1. What does the card 11110 show?
A needle goes through one hole of a deck. Which cards fall out?
Which hole do you use first to sort five-hole cards?
After a pass, how do you stack the two piles?
Five lamps are each ON or OFF. How many settings are there?
The clue "lamp 5 is ON" is X X X X ON. How many of the 32 cards does it keep?
Which clue removes the fewest cards from the deck?
You can now put a number or letter on a card. You can sort a deck one hole at a time. You can shrink a deck of settings with clues.
Next, Data Visualisation & Analysis turns facts into charts.