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-7
6/7 is less than one on the number line.
7
To visualise √7 on a number line you'd have to approximate it - √7 is in exact (surd) form as it is not a whole number. The approximation or decimal form of √7 is roughly 2.65. Or if you prefer, 2.6457513110645905905016157536393. So on a number line, place it between 2 and 3.
If it says add -7 your going left on the number line 7 times