Put 8.98 a little to the left of the number 9 on the number line.
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Between 1 and 2
Put 140 to 150 on a number then you check which is the nearest to 148.
The vinculum is placed on top of the repeating number after the decimal. For example, 1/3 would be written out as .333333 or .3 with the vinculum above the three.
You model your equation on a number line to using a bar model.
At the number 2, draw a vertical line (perpendicular to the number line) and mark a distance of 1 unit on this line. Call this point X The distance from 0 to X is sqrt(5). Put a compass with its point at 0 and the pencil at X, and then draw an arc to cut the number line. That will be sqrt(5) on the number line.