Hi guille_retro, if you have Little Math PRO, you can customize your playback settings to do these:
For Numbers/Quantity Lessons:
Show each quantity in up to 3 display types. For example, when the quantity "15" is taught, a slide showing 15 icons is flashed, followed by a slide showing "15," then a slide showing "fifteen." You can randomize the icon/icon set, color, font, etc. for each display type. Please see attached screenshot, or you can play Sem 1 > Day 96 > "Numeral Lesson 1" for an example.
For Math/Expressions Lessons:
You can only have 1 display type for Math lessons, but you can set the type of icon/icon set, etc. (or randomize) for that display type.
I think what you'd like to do is make Little Math show either icons, numerals or numbers randomly. Unfortunately, that's not possible with Little Math's current set of features, but we hope this information helps!
P.S.
For guides on how to edit the lessons, please follow these links:
Editing Numbers/Quantity LessonsEditing Math/Expresssions Lessons