Monday
Monday: The coordinate grid
Ferris the Fox spreads his trail map on a flat rock. Lines cross it like a net.
"This map is a coordinate grid," he says, pointing with his paw.
"One number line goes across. The other goes up."
Bennie the Bear taps the corner where the lines meet. "This is the origin, at zero and zero."
"To find the old oak, start at the origin," says Ferris.
"Walk 3 across, then 5 up. The oak is at the point three, five."
Bennie smiles. "Across first, then up. The order matters."
Learn it: across, then up
A coordinate grid has two number lines called axes.
The x-axis goes across. The y-axis goes up.
They meet at the origin, the point (0, 0).
An ordered pair like (3, 5) means: go 3 across, then 5 up.
The first number tells how far to travel along the x-axis.
The second number tells how far to travel up, along the y-axis.
So (3, 5) and (5, 3) are different points.
- Read the question.
- Tap your answer.
What are the coordinates of point A?
What are the coordinates of point B?
What are the coordinates of point C?
What are the coordinates of point D?- Read the question.
- Tap your answer.
Which point is at (2, 6)?
Which point is at (1, 5)?
Which point is at (8, 3)?- Think about how Ferris finds a point.
- Tap the steps in order.
| Sentence | True or false? |
|---|---|
| The origin is the point (0, 0). | ? |
| (3, 5) and (5, 3) are the same point. | ? |
| The first number tells how far across to go. | ? |
| The point (0, 4) is on the y-axis. | ? |
Pick one corner as the origin.
Place a small object 3 squares across and 2 squares up.
Say its ordered pair out loud.
Great plotting! Tomorrow Ferris uses the grid to read his trail map.