7.84 = 784/100 = 196/25
.784 = 784/1000 = 98/125
784/16 = 49/1 = 49
784 is bigger than 329.9. It doesn't matter how many digits the number has, but the actual value of the number is all that matters. .9 is actually the fraction 9/10. So, it would be like saying: Which square foot is bigger, 329 and 9/10 or 784.
784 is a squared number because 28*28 = 784
784 -127 = 657
784 = DCCLXXXIV
28 28X28=784
72 * 784 = 56,448
0.0089
28*28 = 784
0.0038
Nope, 784 is NOT divisible by 9.