The best replacement for number line is number line.

The best alternatives to number line are rated as following:
★★★★★  number line

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Speaking about number line, one probably shouldn't forget about negative numbers.

Other search terms related to number line and their ratings are:
★★★★★ negative numbers
★★ tenths
★★ fractions worksheets
★★ positive and negative numbers
★ integers
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number line
number line