This is the classic war poster "Keep Calm and Carry On" reworded to "Keep Calm and Show Your Working". (Which is a british version of 'show your work', not a grammatical error. Both 'Show Your Work' and 'Look Busy' versions of this design are available at my store'.)
I've kept the traditional crown at the top and added 'show your working' as a sticker (or stamp) effect over the 'Carry On'. This is the constant advice of teachers and professors, as well as the motto of scientists and mathematicians everywhere..
I've put this on a purple background, but you can change that really easily. Hit 'Customize it' and then 'edit', and you'll be able to change to absolutely ANY color you prefer.
Customization/Personalization: If you like the design but would prefer a change in wording, or decoration, please contact me. Use the link above, or visit my store and use the 'send message' link, with no obligation to buy.