Idea 7of 13Builds onLines without labels
Points between the lines
Where does a point like (1.5, 4) go?
Today you'll discover
- what 1.5 means on a grid
- decimals in the across number
- decimals in the up number
Think firstPoint D sits between two lines
D is halfway between 1 and 2 across, on the 4 line up. What are its coordinates?
Decide first, then press Next. Find the two lines the point sits between.
A coordinate grid with three points between grid lines: D halfway between 1 and 2 across at 4 up, E at 6 across halfway between 2 and 3 up, and F halfway between 9 and 10 across and between 7 and 8 up. Their coordinates appear in turn: D (1.5, 4), E (6, 2.5), F (9.5, 7.5).
See the whole ideathe big idea and the key word, in one place
The big idea
A decimal coordinate sits between grid lines: 1.5 is halfway between 1 and 2.
For exampleOn a grid labelled in 10s, 15 sits halfway between 10 and 20 in the same way.
Easy to get wrong1.5 and 1.2 are different places: 1.2 is only two tenths of the way from 1 to 2.
Key word
- decimal coordinate
- a coordinate with tenths, like 1.5, that sits between grid lines
Ready to use it?
- Plot points with decimal coordinates.
- Read a point that sits between grid lines.