From Roman cubits to meters Assuming that $a=50$ Roman cubit $(1 cubit =44$cm), and I want to find the surface of this square. I do: **a*a=s**. ($50$ cubits $\times$ $50$ cubits= $2500$ cubits = **$1100$ meters**). But if I calculate how many cubits in $50$ meters I get different results. $50 \times 0.44$cm$=22$m $ \gt 22$m $ \times $ $22$m= **484 meters** (another way: $50$cu $\times$ $44$cm $\times$ $50$cu $\times$ $44$cm=$484$m$^2$). Now, I'm sure the last result is the correct one, but I don't understand why, because at the moment my logic says that the amount of the cubits ($2500$) should be equal to the amounts of cubits in meters ($1100$). But I see different results, then I'm wondering where's my mistake in the understanding? ![enter image description here](

As Mauro said in the comment, when you are multiplying $50 \times 50$ cubits the unit is $(cubits)^2$, so we cannot just multiply by $0.44$ to get $1100$, actually we have to do $2500 \times 0.44^2 =484$ which confirms your other result!

Try converting between $m^2 \rightarrow cm^2$ you have to square the usual factor in which you go from $m \rightarrow cm$