Step 2 Objective
Understand a general statement by finding particular examples that match it.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
What if pupils find this a barrier?
Line Crossings
- Draw three straight lines (line segments) so that some cross over each other.
- How many crossings are there?
- Try different arrangements of the lines. What is the maximum number of possible crossings?
- Try using more lines.
- Is there a rule for the maximum for any number of lines? If so, write it down.
Use the problem Line Crossings.
- Can you draw a different arrangement?
- How many crossings are there?
- Now try another arrangement and explain how many crossings.
- How would you write this down?
"How many crossings? There are one, two, three, four, five crossings"
"Four lines, four crossings"