Idea 5of 13Builds onRead the scale first
Two scales, and halfway
What if the two axes count differently, or a point sits between lines?
Today you'll discover
- how to read each axis on its own
- what a point between two lines is worth
Think firstAcross counts by 1s; up counts by 10s
P is 4 lines across and 7 lines up. What are its coordinates?
Decide first, then press Next. Read the bottom and the side separately.
A coordinate grid numbered by 1s along the bottom and by 10s up the side, to 150, with P at (4, 70) and Q at (11, 30). Then a grid numbered by 2s with S at (5, 7) and T at (10, 3), both sitting halfway between grid lines.
See the whole ideathe big idea and the key word, in one place
The big idea
Read each axis's scale on its own; a point between two lines is between their numbers.
Easy to get wrongThe two axes can count by different amounts. Check the bottom and the side separately before you read a point.
For exampleHeights over time: weeks along the bottom by 1s, centimetres up the side by 10s.
Key word
- halfway
- exactly in the middle between two numbers or two grid lines
Ready to use it?
- Read and plot points when the two axes count differently.
- Read a point that sits halfway between lines.