Idea 3of 22Builds onA graph needs a title and labels
A scale counts in equal steps
How do you read a bar that stops between two lines?
Today you'll discover
- how a scale counts up
- what the interval is
- how to read halfway between lines
Think firstGrade 3's bar stops between two lines
How many cans did Grade 3 collect?
Decide first, then press Next. Read the scale's step before you read a bar.
A bar graph of cans collected for the food bank by Grades 2 to 5, with a scale of 0 to 50 counting by 10s. The scale's steps are marked plus 10; a dashed line runs from the top of the Grade 3 bar across to the scale halfway between 30 and 40, labelled 35. The last step shows a recess graph whose scale counts by 2s.
See the whole ideathe big idea and the key word, in one place
The big idea
A scale counts up in equal steps; the size of one step is the interval.
Reading between linesHalfway between two lines is half a step. On a scale by 10s, halfway between 30 and 40 is 35.
Easy to get wrongCheck the step before you read a bar. A scale by 2s and a scale by 10s can look exactly alike.
Key words
- scale
- the numbers along a graph's side, counting up in equal steps
- interval
- the size of one step on a scale, like 10 in 0, 10, 20, 30
Ready to use it?
- Read a bar that stops between two lines.
- Find the interval of a graph's scale.