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Number Line would be a nice tool for teachers who need a premade number line for their lessons or who need to switch between different intervals very quickly. The clear, clean design is great for working with kids with learning difficulties or visual impairments or with those for whom hand-drawn versions might be confusing for any reason. The option to hide numbers until tapped is great for counting practice or for quick estimation exercises (make a guess, then touch to see if you're right!), while the option to change intervals on the fly is good for illustrating scale properties.Continue reading Show less
Number Line is exactly what it sounds like: a virtual version of a number line. Users can add colored bars (with dashed directional arcs) to an integer number line in the center of the screen and drag to change their length, reposition them, or change their direction (from positive to negative). Whole numbers can be changed to fractions or decimals, and the number line can be highly customized, with controls for the intervals, a tick-mark display, a label display, and spacing. There's an option to cover up all the numbers until they're tapped or to add custom tick marks at arbitrary points. The bars themselves can be automatically numbered by length, blank, or have a fill-in-the-blank field.
A set of annotation tools lets users write notes with a finger or stylus or add formatted equations and expressions. Bars can be deleted or duplicated with a single tap, and entire groups of bars can be selected by dragging a path around them.
Number lines are useful for a great many things in math, and they're an exceptional way to get an intuitive, emotional understanding of numbers and operations, all the way from kindergarten through advanced postsecondary study.
The big issue, however, is that a hand-drawn number line is better for learning than any static, unanimated digital version in so many ways. The tactile sensations of creating the line, counting by steps, moving a finger or pen backward and forward, and shading regions of the line are what solidify the connection between abstract numerical concepts and the concrete world. When everything's virtual and premade, it's all still abstract.
Key Standards Supported
Measurement And Data
Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.
The Number System
Find and position integers and other rational numbers on a horizontal or vertical number line diagram; find and position pairs of integers and other rational numbers on a coordinate plane.