That depends to what number of figures you are rounding to. Rounded to one significant figure, 361 is approximately equal to 400. Rounded to two significant figures, this is equal to 360.
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To the nearest hundred: 300, 100 and 400 To the nearest ten: 340, 90 and 360 To the nearest one: 343, 87 and 361
361 = 19 x 19.
361/1
√361 = 19 Proof: 19 x 19 = 361
1 x 361, 19 x 19 = 361