meter is 100 cm, so 2 decimals in length. But you asked for area which is 2 dimensional length times width so double that. answer = 4 decimal.
1 sq meter = 10,000 sq centimeters
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Answering "How many decimal places to the right do you move to change kilometer square to meter square?"
why do they move the decimals when multiplying
Move the dot 4 spaces to the left Hecto=2 Deka=.2 Meter=.02 Deci=.002 Centi=.0002
Because there are 100 (centi- meaning 100) centimeters in one meter, all you would have to do is move the decimal point to the right 2 places, getting 680
If one meter = 100 centimeters, then you must multiply 0.9 by 100. To do that quickly you must move the decimal point in 0.9 twice to the right. So, 0.9 meters = 90 centimeters.