Before you can graph anything you have to decide how big the number line is. Pick wrong and half your data falls off the edge.
Not started yet.
By the end of this lesson your student should be able to find the range of a data set, choose a scale that includes all the data, choose equal intervals that suit the spread, and explain why more than one scale can be right.
🚨 A scale that cuts off the data. If the scale runs from 8 to 12 and a value is 6.5, that value has nowhere to go, so check both ends against the least and the greatest.
Uneven intervals. Every step on the number line has to be the same size, or the picture lies about how far apart the numbers are.
The eleven numbers are made up for practice. Have the student collect eight or ten real numbers, like the temperatures over a week, and draw two different number lines for them on paper.
The site can't draw a number line yet, so each one is described in words. Sketching them from the description is the practice.
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Before You Start
The words this lesson uses. Tap a card to see what it means, then come back to them whenever a question uses one.
Part One
Questions about the story you just read. Pick your answer straight off, or press Find it in the story if you would rather hunt for the sentence first.
Part Two
The word cards are at the top of this page. Look back at them as often as you need, then answer.