Math for print play online

This app creates an image with basic math problems in A4 size.
Send the generated image to a printing app.

This way anyone learning basic math can train with many randomly generated problems, with no need to look at a screen all the time, but just the pen and the printed paper.

The app has Preferences. You can choose:
Maximum number
Use of zero
Use of and
Text size
Margins
Answer box
Bold text


Small font sizes are hard to see, so you can zoom on the image with double-tap or unpinch gesture (put 2 fingers down and move them away from one another).