Same 900×10=9000 How I got 10? Khdbdcm 1 c= 10mm

for this question you should know 1 cm is 10 mm so 900 cm is equal to 900 * 10 = 9000 mm and you can see that they are same so the answer is 900cm is equal to 9000 mm :))) i hope this is helpful have a nice day