How to draw an A4 paper on the wall with a magnification of ten times? Through projection? Or proportional method?

Proportional method is simple and practical, but it needs painting foundation and takes a long time; Projection method is more troublesome, you can draw with or without art foundation, and it is fast.

There is another method: A4 paper is put 10 times, that is, 2 10mm*297mm is put in 2 100*2970, which can be engraved with a lettering machine and posted on the wall for instructions! Accurate and easy!