/sci/ - Science & Math

Need some latex help please.
How do I get the numbers aligned better?
See how the division, addition, and subtraction are all aligned while the multiplication is off? I want it all aligned. Here's what I was using:
\begin{align}
40 &\div 10 &= \nonumber \\
72 &\div 18 &= \nonumber \\
25 &\cdot 19 &= \nonumber \\
1460 &- 591 &= \nonumber \\
3 &\cdot 29 &= \nonumber \\
2 &\cdot 26 &= \nonumber \\
497 &+ 252 &= \nonumber \\
565 &+ 115 &= \nonumber \\
\end{align}