Maya mathematics in channel box

allyx

I need to edit a number of object attributes, but would like to make it simpler with an equation through the channel box. An expression is not need. For example lets say I need to add 10 to RotateX.
I thought I read how in the Maya Killer Tips book, but have forgotten.

Rob Galanakis

"...you can highlight the fields in question and use *=147 to magically multiply all values by that amount. Other arithmetic operators such as +=, -=, and /=, can all be used to avoid that handheld marvel of technology!"

allyx

I knew it had to type the equal sign, but kept entering in the wrong format.

Thanks