back-of-the-envelope calculation

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back-of-the-envelope calculation

A calculation or mathematical formulation that is approximated in a quick, informal, and rough manner, as might be sketched out on a scrap of paper (such as the back of an envelope). When it came time to pay the bill, we had to do some back-of-the-envelope calculations to figure out who owed how much.
References in classic literature ?
"I wrote 'em on the back of the envelope of my aunt's last letter," he said, and pulled it from between the pages of Sappho.
On the back of the envelope or on the box indicate the name and address of the bidder.
Mr Hinde urged people to post their votes by Tuesday, May 1, and to follow the instructions about signing the back of the envelope and putting their date of birth.
Residential will remain cool as mortgagors continue to carefully evaluate their financial positions, putting away old "back of the envelope" calculations which got them where they are.
automakers look to improve the safety, capabilities, and differentiation of the models in their lineup, their interest increases." To which Badawy adds: "You can't base your future on 'back of the envelope' calculations anymore.
The only other copy is the Boston return address on the back of the envelope.
Make sure the address on the back of the envelope shows through the window.
Placing these labels on the front and back of the envelope and including the required postage will get you the two- to three-day delivery you desire.
envelope format c5, size - 162x229mm self-adhesive transparent polyethylene with a valve (tear tape) for sending accompanying documents, - the straight valve is located along the upper side of the envelope, the adhesive layer on the back of the envelope and on the valve of white silicone glue - 50 000 pieces; envelope format c6, size - 105x148mm 100 000 pcs.
Mr Hinde urged people to help by posting their votes by Tuesday at the latest, and by clearly following the instructions about signing the back of the envelope and putting their date of birth.