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Presentation of 8.1 on number line:
Mark the distance 8.1 units from a fixed point A on a given line to obtain a point B such that AB=8.1 units. From B, mark a distance of 1 unit and mark the new points as C. Find the mid-point of AC and mark that point as O. Draw a semicircle with a centre O and radius OC. Draw a line perpendicular to AC passing through B and intersecting the semicircle at D. Then, BD=8.1.
Now, draw an arc with centre B and radius BD, which intersects the number line in E. Thus, E represents 8.1.
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