M3.9.1 For the adult
Coordinates
How can I tell a friend exactly where a spot is, using only numbers?
What this chapter teaches
Two numbers name one exact place on a grid. The first number tells how far across and the second tells how far up, always counted from the origin. The order matters.
Three questions to ask
There is no one right wording. Listen for the idea.
- Can you show me the point (4, 1) with your finger?
- What is the difference between (2, 5) and (5, 2)?
- How do you find the coordinates of a dot that someone else drew?
After the chapter, the learner can
- Plot a point like (3, 5), going across first and then up
- Read the coordinates of a point on a grid
What they copy into their notebook
Coordinates are two numbers in brackets. The first is across and the second is up. Start at the origin, (0, 0). Across first, then up.