8,000
You find this by dividing 640,000 by 80.
640,000 / 80 = 8000
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The square root of 640000 is 800. This is because the square root of a number is a value that, when multiplied by itself, gives the original number. In this case, 800 multiplied by 800 equals 640000.
80
90 times 80 = 7200
80 x 8000 = 640000
720/80 = 9