Kinetic Energy Equation Help!?

I'm doing a project on the Physics of Sports, but there's a part where you have to explain equations and what not. I know the equation for kinetic energy is KE=.5mv^2. If a kangaroo has the m of 500 kg and he's jumping with a velocity of 10 m/s, the equation is KE=.5(500)(10)^2. From there, I'm not sure what order to solve things. Do I multiply both by .5? Do I square both? When do I multiply 500 and 10? In what order? This is part of Newton's Third Law, if that helps. Thank you in advance!